Difference between revisions of "Module:String/doc"
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This module is intended to provide access to basic string functions. | This module is intended to provide access to basic string functions. | ||
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== Global options == | == Global options == | ||
| − | ; ignore_errors | + | ; {{para|ignore_errors}} : If set to {{code|true}} or {{code|1}}, any error condition will result in an empty string being returned rather than an error message. |
| − | : If set to | + | ; {{para|error_category}} : If an error occurs, specifies the name of a category to include with the error message. The default category is “Errors reported by Module String”. |
| − | ; error_category | + | ; {{para|no_category}} : If set to {{code|true}} or {{code|1}}, no category will be added if an error is generated. |
| − | : If an error occurs, specifies the name of a category to include with the error message. The default category is “Errors reported by Module String”. | ||
| − | ; no_category | ||
| − | : If set to | ||
== len == | == len == | ||
| − | + | The {{strong|len}} function returns the length of the target string. | |
| − | Usage | + | === Usage === |
| − | |||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|len|{{var|target_string}}}}</code> | |
| + | : <code><nowiki>{{#invoke:</nowiki>String|len|s={{var|target_string}}}}</code> | ||
| − | + | === Parameter === | |
| − | + | ; {{para|s}} : The string whose length to report. | |
| − | ; s | ||
| − | : The string whose length to report | ||
| − | Examples | + | === Examples === |
| − | * <code><nowiki>{{#invoke:String|len| abcdefghi }}</nowiki></code> → {{#invoke:String|len| abcdefghi }} | + | |
| − | * <code><nowiki>{{#invoke:String|len|s= abcdefghi }}</nowiki></code> → {{#invoke:String|len|s= abcdefghi }} | + | * <code><nowiki>{{#invoke:String|len|abcdefghi}}</nowiki></code> → {{#invoke:String|len|abcdefghi}} |
| + | * <code><nowiki>{{#invoke:String|len|s=abcdefghi}}</nowiki></code> → {{#invoke:String|len|s=abcdefghi}} | ||
== sub == | == sub == | ||
| − | + | The {{strong|sub}} function returns a substring of the target string at specified indices. | |
| − | Usage | + | === Usage === |
| − | |||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|sub|{{var|target_string}}|{{var|start_index}}|{{var|end_index}}}}</code> | |
| + | : <code><nowiki>{{#invoke:</nowiki>String|sub|s={{var|target_string}}|i={{var|start_index}}|j={{var|end_index}}}}</code> | ||
| − | + | === Parameters === | |
| − | + | ; {{para|s}} : The string to return a subset of. | |
| − | ; s | + | ; {{para|i}} : The first index of the substring to return, defaults to {{code|1}}. |
| − | : The string to return a subset of | + | ; {{para|j}} : The last index of the string to return, defaults to the last character. |
| − | ; i | ||
| − | : The first index of the substring to return, defaults to 1. | ||
| − | ; j | ||
| − | : The last index of the string to return, defaults to the last character. | ||
| − | The first character of the string is assigned an index of 1. If either i or j is a negative value, it is interpreted the same as selecting a character by counting from the end of the string. Hence, a value of -1 is the same as selecting the last character of the string. | + | The first character of the string is assigned an index of 1. If either {{para|i}} or {{para|j}} is a negative value, it is interpreted the same as selecting a character by counting from the end of the string. Hence, a value of -1 is the same as selecting the last character of the string. |
If the requested indices are out of range for the given string, an error is reported. | If the requested indices are out of range for the given string, an error is reported. | ||
| − | Examples | + | === Examples === |
| − | * <code><nowiki> | + | |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|sub|abcdefghi}}</nowiki></code> → {{#invoke:String|sub|abcdefghi}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|sub|s=abcdefghi}}</nowiki></code> → {{#invoke:String|sub|s=abcdefghi}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|sub|abcdefghi|3}}</nowiki></code> → {{#invoke:String|sub|abcdefghi|3}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|sub|s=abcdefghi|i=3}}</nowiki></code> → {{#invoke:String|sub|s=abcdefghi|i=3}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|sub|abcdefghi|3|4}}</nowiki></code> → {{#invoke:String|sub|abcdefghi|3|4}} |
| + | * <code><nowiki>{{#invoke:String|sub|s=abcdefghi|i=3|j=4}}</nowiki></code> → {{#invoke:String|sub|s=abcdefghi|i=3|j=4}} | ||
== sublength == | == sublength == | ||
| − | + | The {{strong|sublength}} function is kept in order to maintain older templates. It returns a substring of the target string starting at a specified index and of a specified length. | |
| + | |||
| + | === Usage === | ||
| + | |||
| + | : <code><nowiki>{{#invoke:</nowiki>String|sublength|s={{var|target_string}}|i={{var|start_index}}|len={{var|length}}}}</code> | ||
| − | + | === Parameters === | |
| − | |||
| − | + | ; {{para|s}} : The string. | |
| − | ; s | + | ; {{para|i}} : The starting index of the substring to return. The first character of the string is assigned an index of 0. |
| − | : The string | + | ; {{para|len}} : The length of the string to return, defaults to the last character. |
| − | ; i | ||
| − | : The starting index of the substring to return. The first character of the string is assigned an index of 0. | ||
| − | ; len | ||
| − | : The length of the string to return, defaults to the last character. | ||
| − | Examples | + | === Examples === |
| − | * <code><nowiki>{{#invoke:String|sublength|s= abcdefghi }}</nowiki></code> → {{#invoke:String|sublength|s= abcdefghi }} | + | |
| − | * <code><nowiki>{{#invoke:String|sublength|s= abcdefghi |i= 3 }}</nowiki></code> → {{#invoke:String|sublength|s= abcdefghi |i= 3 }} | + | * <code><nowiki>{{#invoke:String|sublength|s=abcdefghi}}</nowiki></code> → {{#invoke:String|sublength|s=abcdefghi}} |
| − | * <code><nowiki>{{#invoke:String|sublength|s= abcdefghi |i= 3 |len= 4 }}</nowiki></code> → {{#invoke:String|sublength|s= abcdefghi |i= 3 |len= 4 }} | + | * <code><nowiki>{{#invoke:String|sublength|s=abcdefghi|i=3}}</nowiki></code> → {{#invoke:String|sublength|s=abcdefghi|i=3}} |
| + | * <code><nowiki>{{#invoke:String|sublength|s=abcdefghi|i=3|len=4}}</nowiki></code> → {{#invoke:String|sublength|s=abcdefghi|i=3|len=4}} | ||
== match == | == match == | ||
| − | + | The {{strong|match}} function returns a substring from the source string that matches a specified pattern. | |
| + | |||
| + | === Usage === | ||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|match|{{var|source_string}}|{{var|pattern_string}}|{{var|start_index}}|{{var|match_number}}|{{var|plain_flag}}|{{var|nomatch_output}}}}</code> | |
| − | : <code><nowiki>{{#invoke:</nowiki>String|match| | + | : <code><nowiki>{{#invoke:</nowiki>String|match|s={{var|source_string}}|pattern={{var|pattern_string}}|start={{var|start_index}}|match={{var|match_number}}|plain={{var|plain_flag}}|nomatch={{var|nomatch_output}}}}</code> |
| − | + | === Parameters === | |
| − | : | + | ; {{para|s}} : The string to search. |
| + | ; {{para|pattern}} : The pattern or string to find within the string. | ||
| + | ; {{para|start}} : The index within the source string to start the search. The first character of the string has index 1. Defaults to {{code|1}}. | ||
| + | ; {{para|match}} : In some cases it may be possible to make multiple matches on a single string. This specifies which match to return, where the first match is {{para|match|1}}. If a negative number is specified then a match is returned counting from the last match. Hence {{para|match|-1}} is the same as requesting the last match. Defaults to {{code|1}}. | ||
| + | ; {{para|plain}} : Boolean flag indicating that pattern should be understood as plain text and not as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|Scribunto ustring pattern]] (a unicode‐friendly Lua‐style regular expression). Defaults to false (to change: {{para|plain|true}}). | ||
| + | ; {{para|nomatch}} : If no match is found, output the {{code|nomatch}} value rather than an error. | ||
| + | ; {{para|ignore_errors}} : If no match is found and {{para|ignore_errors|true}}, output an empty string rather than an error. | ||
| − | + | If the {{var|match_number}} or {{var|start_index}} are out of range for the string being queried, then this function generates an error. An error is also generated if no match is found. | |
| − | + | If one adds the parameter {{para|ignore_errors|true}}, then the error will be suppressed and an empty string will be returned on any failure. | |
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| − | + | === Examples === | |
| − | |||
| − | + | * <code><nowiki>{{#invoke:String|match|abc123def456|%d+}}</nowiki></code> → {{#invoke:String|match|abc123def456|%d+}} | |
| − | * <code><nowiki>{{#invoke:String|match| abc123def456 |%d+}}</nowiki></code> → {{#invoke:String|match| abc123def456 |%d+}} | + | * <code><nowiki>{{#invoke:String|match|s=abc123def456|pattern=%d+}}</nowiki></code> → {{#invoke:String|match|s=abc123def456|pattern=%d+}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc123def456 |pattern= %d+ }}</nowiki></code> → {{#invoke:String|match|s= abc123def456 |pattern= %d+ }} | + | * <code><nowiki>{{#invoke:String|match|abc123def456|%d+|6}}</nowiki></code> → {{#invoke:String|match|abc123def456|%d+|6}} |
| − | * <code><nowiki>{{#invoke:String|match| abc123def456 |%d+|6}}</nowiki></code> → {{#invoke:String|match| abc123def456 |%d+|6}} | + | * <code><nowiki>{{#invoke:String|match|s=abc123def456|pattern=%d+|start=6}}</nowiki></code> → {{#invoke:String|match|s=abc123def456|pattern=%d+|start=6}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc123def456 |pattern= %d+ |start= 6 }}</nowiki></code> → {{#invoke:String|match|s= abc123def456 |pattern= %d+ |start= 6 }} | + | * <code><nowiki>{{#invoke:String|match|s=abc123def456|pattern=%d+|start=6|match=2}}</nowiki></code> → {{#invoke:String|match|s=abc123def456|pattern=%d+|start=6|match=2}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc123def456 |pattern= %d+ |start= 6 |match= 2 }}</nowiki></code> → {{#invoke:String|match|s= abc123def456 |pattern= %d+ |start= 6 |match= 2 }} | + | * <code><nowiki>{{#invoke:String|match|s=abc123%d+|pattern=%d+}}</nowiki></code> → {{#invoke:String|match|s=abc123%d+|pattern=%d+}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc123%d+ |pattern= %d+ }}</nowiki></code> → {{#invoke:String|match|s= abc123%d+ |pattern= %d+ }} | + | * <code><nowiki>{{#invoke:String|match|s=abc123%d+|pattern=%d+|plain=true}}</nowiki></code> → {{#invoke:String|match|s=abc123%d+|pattern=%d+|plain=true}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc123%d+ |pattern= %d+ |plain= true }}</nowiki></code> → {{#invoke:String|match|s= abc123%d+ |pattern= %d+ |plain= true }} | + | * <code><nowiki>{{#invoke:String|match|s=abc|pattern=%d|nomatch=No numeric characters in string}}</nowiki></code> → {{#invoke:String|match|s=abc|pattern=%d|nomatch=No numeric characters in string}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc |pattern= %d |nomatch= No numeric characters in string }}</nowiki></code> → {{#invoke:String|match|s= abc |pattern= %d |nomatch= No numeric characters in string }} | + | * <code><nowiki>{{#invoke:String|match|s=abc|pattern=%d|ignore_errors=true}}</nowiki></code> → {{#invoke:String|match|s=abc|pattern=%d|ignore_errors=true}} |
| − | * <code><nowiki>{{#invoke:String|match|s= abc |pattern= %d |ignore_errors= true }}</nowiki></code> → {{#invoke:String|match|s= abc |pattern= %d |ignore_errors= true }} | + | * <code><nowiki>{{#invoke:String|match|s=0012001200|pattern=0*(%d*)}}</nowiki></code> → {{#invoke:String|match|s=0012001200|pattern=0*(%d*)}} |
| − | * <code><nowiki>{{#invoke:String|match|s= 0012001200 |pattern= 0*(%d*) }}</nowiki></code> → {{#invoke:String|match|s= 0012001200 |pattern= 0*(%d*) }} | ||
== pos == | == pos == | ||
| − | + | The {{strong|pos}} function returns a single character from the target string at position pos. | |
| − | Usage | + | === Usage === |
| − | |||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|pos|{{var|target_string}}|{{var|index_value}}}}</code> | |
| + | : <code><nowiki>{{#invoke:</nowiki>String|pos|target={{var|target_string}}|pos={{var|index_value}}}}</code> | ||
| − | + | === Parameters === | |
| − | + | ; {{para|target}} : The string to search. | |
| − | ; target | + | ; {{para|pos}} : The index for the character to return. |
| − | : The string to search | ||
| − | ; pos | ||
| − | : The index for the character to return | ||
| − | The first character has an index value of 1. If one requests a negative value, this function will select a character by counting | + | The first character has an index value of 1. If one requests a negative value, this function will select a character by counting backward from the end of the string. In other words, {{para|pos|-1}} is the same as asking for the last character. |
A requested value of zero, or a value greater than the length of the string returns an error. | A requested value of zero, or a value greater than the length of the string returns an error. | ||
| − | Examples | + | === Examples === |
| − | * <code><nowiki>{{#invoke:String|pos| abcdefghi | 4 }}</nowiki></code> → {{#invoke:String|pos| abcdefghi | 4 }} | + | |
| − | * <code><nowiki>{{#invoke:String|pos|target= abcdefghi |pos= 4 }}</nowiki></code> → {{#invoke:String|pos|target= abcdefghi |pos= 4 }} | + | * <code><nowiki>{{#invoke:String|pos|abcdefghi|4}}</nowiki></code> → {{#invoke:String|pos| abcdefghi|4}} |
| + | * <code><nowiki>{{#invoke:String|pos|target=abcdefghi|pos=4}}</nowiki></code> → {{#invoke:String|pos|target=abcdefghi|pos=4}} | ||
== str_find == | == str_find == | ||
| − | + | The {{strong|str-find}} function duplicates the behavior of {{tlg|code=yes|nolink=yes|str_find}}, including all of its quirks. This is provided in order to support existing templates but is NOT RECOMMENDED for new code and templates. New code is recommended to use the “find” function instead. | |
| − | Returns the first index in | + | Returns the first index in {{code|source}} that is a match to {{code|target}}. Indexing is 1‐based, and the function returns “-1” if the {{var|target_string}} is not present in {{var|source_string}}. |
| − | Important Note: If the | + | Important Note: If the {{var|target_string}} is empty or missing, this function returns a value of “1”, which is generally unexpected behavior, and must be accounted for separately. |
| − | Usage | + | === Usage === |
| − | |||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|find|{{var|source_string}}|{{var|target_string}}}}</code> | |
| + | : <code><nowiki>{{#invoke:</nowiki>String|find|source={{var|source_string}}|target={{var|target_string}}}}</code> | ||
| − | + | === Parameters === | |
| − | + | ; {{para|source}} : The string to search. | |
| − | ; source | + | ; {{para|target}} : The string to find within source. |
| − | : The string to search | ||
| − | ; target | ||
| − | : The string to find within source | ||
| − | Examples | + | === Examples === |
| − | * <code><nowiki>{{#invoke:String|str_find| abc123def }}</nowiki></code> → {{#invoke:String|str_find| abc123def }} | + | |
| − | * <code><nowiki>{{#invoke:String|str_find|source= abc123def }}</nowiki></code> → {{#invoke:String|str_find|source= abc123def }} | + | * <code><nowiki>{{#invoke:String|str_find|abc123def}}</nowiki></code> → {{#invoke:String|str_find|abc123def}} |
| − | * <code><nowiki>{{#invoke:String|str_find| abc123def |123}}</nowiki></code> → {{#invoke:String|str_find| abc123def |123}} | + | * <code><nowiki>{{#invoke:String|str_find|source=abc123def}}</nowiki></code> → {{#invoke:String|str_find|source=abc123def}} |
| − | * <code><nowiki>{{#invoke:String|str_find|source= abc123def |target= 123 }}</nowiki></code> → {{#invoke:String|str_find|source= abc123def |target= 123 }} | + | * <code><nowiki>{{#invoke:String|str_find|abc123def|123}}</nowiki></code> → {{#invoke:String|str_find|abc123def|123}} |
| + | * <code><nowiki>{{#invoke:String|str_find|source=abc123def|target=123}}</nowiki></code> → {{#invoke:String|str_find|source=abc123def|target=123}} | ||
== find == | == find == | ||
| − | + | The {{strong|find}} function allows one to search for a target string or pattern within another string. | |
| − | Usage | + | === Usage === |
| − | |||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|find|{{var|source_string}}|{{var|target_string}}|{{var|start_index}}|{{var|plain_flag}}}}</code> | |
| + | : <code><nowiki>{{#invoke:</nowiki>String|find|source={{var|source_string}}|target={{var|target_string}}|start={{var|start_index}}|plain={{var|plain_flag}}}}</code> | ||
| − | + | === Parameters === | |
| − | + | ; {{para|source}} : The string to search. | |
| − | ; source | + | ; {{para|target}} : The string or pattern to find within source. |
| − | : The string to search | + | ; {{para|start}} : The index within the source string to start the search, defaults to {{code|1}}. |
| − | ; target | + | ; {{para|plain}} : Boolean flag indicating that target should be understood as plain text and not as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|Scribunto ustring pattern]] (a unicode‐friendly Lua‐style regular expression); defaults to true. |
| − | : The string or pattern to find within source | ||
| − | ; start | ||
| − | : The index within the source string to start the search, defaults to 1 | ||
| − | ; plain | ||
| − | : Boolean flag indicating that target should be understood as plain text and not as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|Scribunto ustring pattern]] (a unicode‐friendly Lua‐style regular expression); defaults to true | ||
| − | This function returns the first index >= | + | This function returns the first index >= {{code|start}} where {{code|target}} can be found within {{code|source}}. Indices are 1‐based. If {{code|target}} is not found, then this function returns “0”. If either {{para|source}} or {{para|target}} are missing or empty, this function also returns “0”. |
This function should be safe for UTF-8 strings. | This function should be safe for UTF-8 strings. | ||
| − | Examples | + | === Examples === |
| + | |||
* <code><nowiki>{{#invoke:String|find|abc123def|12}}</nowiki></code> → {{#invoke:String|find|abc123def|12}} | * <code><nowiki>{{#invoke:String|find|abc123def|12}}</nowiki></code> → {{#invoke:String|find|abc123def|12}} | ||
| − | |||
* <code><nowiki>{{#invoke:String|find|source=abc123def|target=12}}</nowiki></code> → {{#invoke:String|find|source=abc123def|target=12}} | * <code><nowiki>{{#invoke:String|find|source=abc123def|target=12}}</nowiki></code> → {{#invoke:String|find|source=abc123def|target=12}} | ||
| − | |||
* <code><nowiki>{{#invoke:String|find|source=abc123def|target=pqr}}</nowiki></code> → {{#invoke:String|find|source=abc123def|target=pqr}} | * <code><nowiki>{{#invoke:String|find|source=abc123def|target=pqr}}</nowiki></code> → {{#invoke:String|find|source=abc123def|target=pqr}} | ||
| − | |||
* <code><nowiki>{{#invoke:String|find| abc123def |123}}</nowiki></code> → {{#invoke:String|find| abc123def |123}} | * <code><nowiki>{{#invoke:String|find| abc123def |123}}</nowiki></code> → {{#invoke:String|find| abc123def |123}} | ||
* <code><nowiki>{{#invoke:String|find|source= abc123def |target= 123 }}</nowiki></code> → {{#invoke:String|find|source= abc123def |target= 123 }} | * <code><nowiki>{{#invoke:String|find|source= abc123def |target= 123 }}</nowiki></code> → {{#invoke:String|find|source= abc123def |target= 123 }} | ||
| − | * <code><nowiki>{{#invoke:String|find|source=abc123def|target=%d |start=3 |plain=false }}</nowiki></code> → {{#invoke:String|find|source=abc123def|target=%d |start=3 |plain=false }} | + | * <code><nowiki>{{#invoke:String|find|source=abc123def|target=%d|start=3|plain=false}}</nowiki></code> → {{#invoke:String|find|source=abc123def|target=%d|start=3|plain=false}} |
When using unnamed parameters, preceding and trailing spaces are kept and counted: | When using unnamed parameters, preceding and trailing spaces are kept and counted: | ||
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== replace == | == replace == | ||
| − | + | The {{strong|replace}} function allows one to replace a target string or pattern within another string. | |
| + | |||
| + | === Usage === | ||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|replace|{{var|source_str}}|{{var|pattern_string}}|{{var|replace_string}}|{{var|replacement_count}}|{{var|plain_flag}}}}</code> | |
| − | : <code><nowiki>{{#invoke:</nowiki>String|replace| | + | : <code><nowiki>{{#invoke:</nowiki>String|replace|source={{var|source_string}}|pattern={{var|pattern_string}}|replace={{var|replace_string}}|count={{var|replacement_count}}|plain={{var|plain_flag}}}}</code> |
| − | + | === Parameters === | |
| − | + | ; {{para|source}} : The string to search. | |
| + | ; {{para|pattern}} : The string or pattern to find within source. | ||
| + | ; {{para|replace}} : The replacement text. | ||
| + | ; {{para|count}} : The number of occurrences to replace; defaults to {{code|all}}. | ||
| + | ; {{para|plain}} : Boolean flag indicating that pattern should be understood as plain text and not as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|Scribunto ustring pattern]] (a unicode‐friendly Lua‐style regular expression); defaults to {{code|true}}. | ||
| − | + | === Examples === | |
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| − | + | * <code><nowiki>{{#invoke:String|replace|abc123def456|123|N}}</nowiki></code> → {{#invoke:String|replace|abc123def456|123|N}} | |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|replace|source=abc123def456|pattern=123|replace=N}}</nowiki></code> → {{#invoke:String|replace|source=abc123def456|pattern=123|replace=N}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|replace|abc123def456|%d+|N|1|false}}</nowiki></code> → {{#invoke:String|replace|abc123def456|%d+|N|1|false}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|replace|source=abc123def456|pattern=%d+|replace=N|count=1|plain=false}}</nowiki></code> → {{#invoke:String|replace|source=abc123def456|pattern=%d+|replace=N|count=1|plain=false}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|replace|source=abc123def456|pattern=%d+|replace=N|plain=false}}</nowiki></code> → {{#invoke:String|replace|source=abc123def456|pattern=%d+|replace=N|plain=false}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|replace|source=0012001200|pattern=^0*|plain=false}}</nowiki></code> → {{#invoke:String|replace|source=0012001200|pattern=^0*|plain=false}} |
| − | * <code><nowiki>{{#invoke:String|replace|source= 0012001200 |pattern= ^0* |plain= false }}</nowiki></code> → {{#invoke:String|replace|source= 0012001200 |pattern= ^0* |plain= false }} | ||
== rep == | == rep == | ||
| − | + | The {{strong|rep}} function repeats a string {{var|n}} times. A simple function to pipe string.rep to templates. | |
| + | |||
| + | === Usage === | ||
| + | |||
| + | : <code><nowiki>{{#invoke:</nowiki>String|rep|{{var|source}}|{{var|count}}}}</code> | ||
| + | |||
| + | === Parameters === | ||
| − | + | ; {{para|source}} : The string to repeat. | |
| − | + | ; {{para|count}} : The number of repetitions. | |
| − | + | === Examples === | |
| − | |||
| − | |||
| − | |||
| − | |||
| − | + | * <code><nowiki>{{#invoke:String|rep|hello|3}}</nowiki></code> → {{#invoke:String|rep|hello|3}} | |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|rep| hello |3}}</nowiki></code> → {{#invoke:String|rep| hello |3}} |
| − | * <code><nowiki> | ||
== escapePattern == | == escapePattern == | ||
| − | + | The {{strong|escapePattern}} function escapes magic characters in a [[mw:LUAREF#Patterns|Lua pattern]]. If you convert a string using this function, then the converted string will be interpreted as a literal string in functions that accept Lua patterns. For example, {{code|.}}, meaning “any character”, will be converted to {{code|%.}}, meaning the literal character “.”. | |
| + | |||
| + | === Usage === | ||
| + | |||
| + | : <code><nowiki>{{#invoke:String|escapePattern|</nowiki>{{var|pattern_string}}<nowiki>}}</nowiki></code> | ||
| − | + | === Parameters === | |
| − | |||
| − | + | ; {{para|pattern_string}} : The pattern string to escape. | |
| − | ; pattern_string | ||
| − | : The pattern string to escape | ||
| − | Examples | + | === Examples === |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|escapePattern|A.D.}}</nowiki></code> → {{#invoke:String|escapePattern|A.D.}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|escapePattern|10%}}</nowiki></code> → {{#invoke:String|escapePattern|10%}} |
== count == | == count == | ||
| − | + | The {{strong|count}} function counts the number of times a given pattern appears in the arguments that get passed on to this module. | |
| + | |||
| + | === Usage === | ||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|count|{{var|source_str}}|{{var|pattern_string}}|{{var|plain_flag}}}}</code> | |
| − | : <code><nowiki>{{#invoke:</nowiki>String|count| | + | : <code><nowiki>{{#invoke:</nowiki>String|count|source={{var|source_string}}|pattern={{var|pattern_string}}|plain={{var|plain_flag}}}}</code> |
| − | + | === Parameters === | |
| − | + | ; {{para|source_string}} : The string to count occurrences in. | |
| − | + | ; {{para|pattern}} : The string or pattern to count occurrences of within source. | |
| − | + | ; {{para|plain}} : Boolean flag indicating that pattern should be understood as plain text and not as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|Scribunto ustring pattern]] (a unicode‐friendly Lua‐style regular expression); defaults to {{code|true}}. | |
| − | : The string to count occurrences in | ||
| − | ; pattern | ||
| − | : The string or pattern to count occurrences of within source | ||
| − | ; plain | ||
| − | : Boolean flag indicating that pattern should be understood as plain text and not as a [[mw:Extension:Scribunto/Lua reference manual#Ustring patterns|Scribunto ustring pattern]] (a unicode‐friendly Lua‐style regular expression); defaults to true | ||
| − | Examples | + | === Examples === |
| − | * Count of | + | |
| − | * Count of | + | * Count of {{var|a}}: <code><nowiki>{{#invoke:String|count|aabbcc|a}}</nowiki></code> → {{#invoke:String|count|aabbcc|a}} |
| − | * Count of | + | * Count of either {{var|a}} or {{var|c}}:<code><nowiki>{{#invoke:String|count|aabbcc|[ac]|plain=false}}</nowiki></code> → {{#invoke:String|count|aabbcc|[ac]|plain=false}} |
| − | * Count of | + | * Count of not {{var|a}} : <code><nowiki>{{#invoke:String|count|aaabaaac|[^a]|plain=false}}</nowiki></code> → {{#invoke:String|count|aaabaaac|[^a]|plain=false}} |
| + | * Count of starts with {{var|a}} : <code><nowiki>{{#invoke:String|count|aaabaaac|^a|plain=false}}</nowiki></code> → {{#invoke:String|count|aaabaaac|^a|plain=false}} | ||
== join == | == join == | ||
| − | + | The {{strong|join}} function joins all strings passed as arguments into one string, treating the first argument as a separator | |
| + | |||
| + | === Usage === | ||
| + | |||
| + | : <code><nowiki>{{#invoke:</nowiki>String|join|{{var|separator}}|{{var|string1}}|{{var|string2}}|…}}</code> | ||
| − | + | === Parameters === | |
| − | |||
| − | + | ; {{para|separator}} : String that separates each string being joined together. | |
| − | ; separator | + | : Note that leading and trailing spaces are {{em|not}} stripped from the separator. |
| − | : String that separates each string being joined together | + | ; {{para|string1}}, {{para|string2}}, etc. : Strings being joined together. |
| − | : Note that leading and trailing spaces are | ||
| − | ; string1 | ||
| − | : Strings being joined together | ||
| − | Examples | + | === Examples === |
| − | |||
| − | |||
| − | |||
| − | |||
| − | |||
| − | The preceding example uses the | + | * <code><nowiki>{{#invoke:String|join|x|foo|bar|baz}}</nowiki></code> → {{#invoke:String|join|x|foo|bar|baz}} |
| + | * <code><nowiki>{{#invoke:String|join||a|b|c|d|e|f|g}}</nowiki></code> → {{#invoke:String|join||a|b|c|d|e|f|g}} | ||
| + | * <code><nowiki>{{#invoke:String|join|,|a|b|c|d|e|f|g}}</nowiki></code> → {{#invoke:String|join|,|a|b|c|d|e|f|g}} | ||
| + | * <code><nowiki>{{#invoke:String|join|, |a|b|c|d|e|f|g}</nowiki></code> → {{#invoke:String|join|, |a|b|c|d|e|f|g}} | ||
| + | * <code><nowiki>{{#invoke:String|join| – |a|b|c|d|e|f|g}}</nowiki></code> → {{#invoke:String|join| – |a|b|c|d|e|f|g}} | ||
| + | |||
| + | The preceding example uses the HTML entity &ndash; but the unicode character also works. | ||
== endswith == | == endswith == | ||
| − | + | The {{strong|endswith}} function returns “yes” if the source string ends with the pattern string. Both strings are trimmed before use. | |
| − | + | ||
| + | === Usage === | ||
| − | + | : <code><nowiki>{{#invoke:</nowiki>String|count|{{var|source_str}}|{{var|pattern_string}}}}</code> | |
| + | : <code><nowiki>{{#invoke:</nowiki>String|count|source={{var|source_string}}|pattern={{var|pattern_string}}}}</code> | ||
| − | + | === Examples === | |
| − | |||
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|endswith|xxxyyy|y}}</nowiki></code> → {{#invoke:String|endswith|xxxyyy|y}} |
| − | * <code><nowiki> | + | * <code><nowiki>{{#invoke:String|endswith|xxxyyy|z}}</nowiki></code> → {{#invoke:String|endswith|xxxyyy|z}} |
| − | [[Category:Modules documentation]] | + | [[Category:Modules]][[Category:Modules documentation]] |
Latest revision as of 20:56, 24 July 2020
This module is intended to provide access to basic string functions.
Most of the functions provided here can be invoked with named parameters, unnamed parameters, or a mixture. If named parameters are used, MediaWiki will automatically remove any leading or trailing whitespace from the parameter. Depending on the intended use, it may be advantageous to either preserve or remove such whitespace.
Global options
|ignore_errors=- If set to
trueor1, any error condition will result in an empty string being returned rather than an error message. |error_category=- If an error occurs, specifies the name of a category to include with the error message. The default category is “Errors reported by Module String”.
|no_category=- If set to
trueor1, no category will be added if an error is generated.
len
The len function returns the length of the target string.
Usage
{{#invoke:String|len|target_string}}{{#invoke:String|len|s=target_string}}
Parameter
|s=- The string whose length to report.
Examples
{{#invoke:String|len|abcdefghi}}→ 9{{#invoke:String|len|s=abcdefghi}}→ 9
sub
The sub function returns a substring of the target string at specified indices.
Usage
{{#invoke:String|sub|target_string|start_index|end_index}}{{#invoke:String|sub|s=target_string|i=start_index|j=end_index}}
Parameters
|s=- The string to return a subset of.
|i=- The first index of the substring to return, defaults to
1. |j=- The last index of the string to return, defaults to the last character.
The first character of the string is assigned an index of 1. If either |i= or |j= is a negative value, it is interpreted the same as selecting a character by counting from the end of the string. Hence, a value of -1 is the same as selecting the last character of the string.
If the requested indices are out of range for the given string, an error is reported.
Examples
{{#invoke:String|sub|abcdefghi}}→ abcdefghi{{#invoke:String|sub|s=abcdefghi}}→ abcdefghi{{#invoke:String|sub|abcdefghi|3}}→ cdefghi{{#invoke:String|sub|s=abcdefghi|i=3}}→ cdefghi{{#invoke:String|sub|abcdefghi|3|4}}→ cd{{#invoke:String|sub|s=abcdefghi|i=3|j=4}}→ cd
sublength
The sublength function is kept in order to maintain older templates. It returns a substring of the target string starting at a specified index and of a specified length.
Usage
{{#invoke:String|sublength|s=target_string|i=start_index|len=length}}
Parameters
|s=- The string.
|i=- The starting index of the substring to return. The first character of the string is assigned an index of 0.
|len=- The length of the string to return, defaults to the last character.
Examples
{{#invoke:String|sublength|s=abcdefghi}}→ abcdefghi{{#invoke:String|sublength|s=abcdefghi|i=3}}→ defghi{{#invoke:String|sublength|s=abcdefghi|i=3|len=4}}→ defg
match
The match function returns a substring from the source string that matches a specified pattern.
Usage
{{#invoke:String|match|source_string|pattern_string|start_index|match_number|plain_flag|nomatch_output}}{{#invoke:String|match|s=source_string|pattern=pattern_string|start=start_index|match=match_number|plain=plain_flag|nomatch=nomatch_output}}
Parameters
|s=- The string to search.
|pattern=- The pattern or string to find within the string.
|start=- The index within the source string to start the search. The first character of the string has index 1. Defaults to
1. |match=- In some cases it may be possible to make multiple matches on a single string. This specifies which match to return, where the first match is
|match=1. If a negative number is specified then a match is returned counting from the last match. Hence|match=-1is the same as requesting the last match. Defaults to1. |plain=- Boolean flag indicating that pattern should be understood as plain text and not as a Scribunto ustring pattern (a unicode‐friendly Lua‐style regular expression). Defaults to false (to change:
|plain=true). |nomatch=- If no match is found, output the
nomatchvalue rather than an error. |ignore_errors=- If no match is found and
|ignore_errors=true, output an empty string rather than an error.
If the match_number or start_index are out of range for the string being queried, then this function generates an error. An error is also generated if no match is found.
If one adds the parameter |ignore_errors=true, then the error will be suppressed and an empty string will be returned on any failure.
Examples
{{#invoke:String|match|abc123def456|%d+}}→ 123{{#invoke:String|match|s=abc123def456|pattern=%d+}}→ 123{{#invoke:String|match|abc123def456|%d+|6}}→ 3{{#invoke:String|match|s=abc123def456|pattern=%d+|start=6}}→ 3{{#invoke:String|match|s=abc123def456|pattern=%d+|start=6|match=2}}→ 456{{#invoke:String|match|s=abc123%d+|pattern=%d+}}→ 123{{#invoke:String|match|s=abc123%d+|pattern=%d+|plain=true}}→ %d+{{#invoke:String|match|s=abc|pattern=%d|nomatch=No numeric characters in string}}→ No numeric characters in string{{#invoke:String|match|s=abc|pattern=%d|ignore_errors=true}}→{{#invoke:String|match|s=0012001200|pattern=0*(%d*)}}→ 12001200
pos
The pos function returns a single character from the target string at position pos.
Usage
{{#invoke:String|pos|target_string|index_value}}{{#invoke:String|pos|target=target_string|pos=index_value}}
Parameters
|target=- The string to search.
|pos=- The index for the character to return.
The first character has an index value of 1. If one requests a negative value, this function will select a character by counting backward from the end of the string. In other words, |pos=-1 is the same as asking for the last character.
A requested value of zero, or a value greater than the length of the string returns an error.
Examples
{{#invoke:String|pos|abcdefghi|4}}→ c{{#invoke:String|pos|target=abcdefghi|pos=4}}→ d
str_find
The str-find function duplicates the behavior of {{str_find}}, including all of its quirks. This is provided in order to support existing templates but is NOT RECOMMENDED for new code and templates. New code is recommended to use the “find” function instead.
Returns the first index in source that is a match to target. Indexing is 1‐based, and the function returns “-1” if the target_string is not present in source_string.
Important Note: If the target_string is empty or missing, this function returns a value of “1”, which is generally unexpected behavior, and must be accounted for separately.
Usage
{{#invoke:String|find|source_string|target_string}}{{#invoke:String|find|source=source_string|target=target_string}}
Parameters
|source=- The string to search.
|target=- The string to find within source.
Examples
{{#invoke:String|str_find|abc123def}}→ 1{{#invoke:String|str_find|source=abc123def}}→ 1{{#invoke:String|str_find|abc123def|123}}→ 4{{#invoke:String|str_find|source=abc123def|target=123}}→ 4
find
The find function allows one to search for a target string or pattern within another string.
Usage
{{#invoke:String|find|source_string|target_string|start_index|plain_flag}}{{#invoke:String|find|source=source_string|target=target_string|start=start_index|plain=plain_flag}}
Parameters
|source=- The string to search.
|target=- The string or pattern to find within source.
|start=- The index within the source string to start the search, defaults to
1. |plain=- Boolean flag indicating that target should be understood as plain text and not as a Scribunto ustring pattern (a unicode‐friendly Lua‐style regular expression); defaults to true.
This function returns the first index >= start where target can be found within source. Indices are 1‐based. If target is not found, then this function returns “0”. If either |source= or |target= are missing or empty, this function also returns “0”.
This function should be safe for UTF-8 strings.
Examples
{{#invoke:String|find|abc123def|12}}→ 4{{#invoke:String|find|source=abc123def|target=12}}→ 4{{#invoke:String|find|source=abc123def|target=pqr}}→ 0{{#invoke:String|find| abc123def |123}}→ 5{{#invoke:String|find|source= abc123def |target= 123 }}→ 4{{#invoke:String|find|source=abc123def|target=%d|start=3|plain=false}}→ 4
When using unnamed parameters, preceding and trailing spaces are kept and counted:
{{#invoke:String|find| abc123def |c|false}}→ 4{{#invoke:String|find|source= abc123def |target=c|plain=false}}→ 3
replace
The replace function allows one to replace a target string or pattern within another string.
Usage
{{#invoke:String|replace|source_str|pattern_string|replace_string|replacement_count|plain_flag}}{{#invoke:String|replace|source=source_string|pattern=pattern_string|replace=replace_string|count=replacement_count|plain=plain_flag}}
Parameters
|source=- The string to search.
|pattern=- The string or pattern to find within source.
|replace=- The replacement text.
|count=- The number of occurrences to replace; defaults to
all. |plain=- Boolean flag indicating that pattern should be understood as plain text and not as a Scribunto ustring pattern (a unicode‐friendly Lua‐style regular expression); defaults to
true.
Examples
{{#invoke:String|replace|abc123def456|123|N}}→ abcNdef456{{#invoke:String|replace|source=abc123def456|pattern=123|replace=N}}→ abcNdef456{{#invoke:String|replace|abc123def456|%d+|N|1|false}}→ abcNdef456{{#invoke:String|replace|source=abc123def456|pattern=%d+|replace=N|count=1|plain=false}}→ abcNdef456{{#invoke:String|replace|source=abc123def456|pattern=%d+|replace=N|plain=false}}→ abcNdefN{{#invoke:String|replace|source=0012001200|pattern=^0*|plain=false}}→ 12001200
rep
The rep function repeats a string n times. A simple function to pipe string.rep to templates.
Usage
{{#invoke:String|rep|source|count}}
Parameters
|source=- The string to repeat.
|count=- The number of repetitions.
Examples
{{#invoke:String|rep|hello|3}}→ hellohellohello{{#invoke:String|rep| hello |3}}→ hello hello hello
escapePattern
The escapePattern function escapes magic characters in a Lua pattern. If you convert a string using this function, then the converted string will be interpreted as a literal string in functions that accept Lua patterns. For example, ., meaning “any character”, will be converted to %., meaning the literal character “.”.
Usage
{{#invoke:String|escapePattern|pattern_string}}
Parameters
|pattern_string=- The pattern string to escape.
Examples
{{#invoke:String|escapePattern|A.D.}}→ A%.D%.{{#invoke:String|escapePattern|10%}}→ 10%%
count
The count function counts the number of times a given pattern appears in the arguments that get passed on to this module.
Usage
{{#invoke:String|count|source_str|pattern_string|plain_flag}}{{#invoke:String|count|source=source_string|pattern=pattern_string|plain=plain_flag}}
Parameters
|source_string=- The string to count occurrences in.
|pattern=- The string or pattern to count occurrences of within source.
|plain=- Boolean flag indicating that pattern should be understood as plain text and not as a Scribunto ustring pattern (a unicode‐friendly Lua‐style regular expression); defaults to
true.
Examples
- Count of a:
{{#invoke:String|count|aabbcc|a}}→ 2 - Count of either a or c:
{{#invoke:String|count|aabbcc|[ac]|plain=false}}→ 4 - Count of not a :
{{#invoke:String|count|aaabaaac|[^a]|plain=false}}→ 2 - Count of starts with a :
{{#invoke:String|count|aaabaaac|^a|plain=false}}→ 1
join
The join function joins all strings passed as arguments into one string, treating the first argument as a separator
Usage
{{#invoke:String|join|separator|string1|string2|…}}
Parameters
|separator=- String that separates each string being joined together.
- Note that leading and trailing spaces are not stripped from the separator.
|string1=,|string2=, etc.- Strings being joined together.
Examples
{{#invoke:String|join|x|foo|bar|baz}}→ fooxbarxbaz{{#invoke:String|join||a|b|c|d|e|f|g}}→ abcdefg{{#invoke:String|join|,|a|b|c|d|e|f|g}}→ a,b,c,d,e,f,g{{#invoke:String|join|, |a|b|c|d|e|f|g}→ a, b, c, d, e, f, g{{#invoke:String|join| – |a|b|c|d|e|f|g}}→ a – b – c – d – e – f – g
The preceding example uses the HTML entity – but the unicode character also works.
endswith
The endswith function returns “yes” if the source string ends with the pattern string. Both strings are trimmed before use.
Usage
{{#invoke:String|count|source_str|pattern_string}}{{#invoke:String|count|source=source_string|pattern=pattern_string}}
Examples
{{#invoke:String|endswith|xxxyyy|y}}→ yes{{#invoke:String|endswith|xxxyyy|z}}→