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Module:String: Difference between revisions
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Parameters | Parameters | ||
s: The string to return a subset of | s: The string to return a subset of | ||
i: The | 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. | j: The last index of the string to return, defaults to the last character. | ||
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--[[ | --[[ | ||
_match | |||
This function returns a substring from the source string that matches a | This function returns a substring from the source string that matches a | ||
specified pattern. | specified pattern. It is exported for use in other modules | ||
Usage: | Usage: | ||
strmatch = require("Module:String")._match | |||
sresult = strmatch( s, pattern, start, match, plain, nomatch ) | |||
Parameters | Parameters | ||
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text. Defaults to false. | text. Defaults to false. | ||
nomatch: If no match is found, output the "nomatch" value rather than an error. | nomatch: If no match is found, output the "nomatch" value rather than an error. | ||
For information on constructing Lua patterns, a form of [regular expression], see: | For information on constructing Lua patterns, a form of [regular expression], see: | ||
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end | end | ||
end | end | ||
--[[ | |||
match | |||
This 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}} | |||
OR | |||
{{#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 = -1 is the same as requesting | |||
the last match. Defaults to 1. | |||
plain: A flag indicating that the pattern should be understood as plain | |||
text. Defaults to false. | |||
nomatch: If no match is found, output the "nomatch" value rather than an error. | |||
If invoked using named parameters, Mediawiki will automatically remove any leading or | |||
trailing whitespace from each string. In some circumstances this is desirable, in | |||
other cases one may want to preserve the whitespace. | |||
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. | |||
For information on constructing Lua patterns, a form of [regular expression], see: | |||
* http://www.lua.org/manual/5.1/manual.html#5.4.1 | |||
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Patterns | |||
* http://www.mediawiki.org/wiki/Extension:Scribunto/Lua_reference_manual#Ustring_patterns | |||
]] | |||
-- This is the entry point for #invoke:String|match | -- This is the entry point for #invoke:String|match | ||
function str.match( frame ) | function str.match( frame ) | ||