LIST regexp(STRING str, STRING regexp[, INTEGER cs])
This function matches the regular expression argument regexp against the argument str. If cs is specified and is true, the match is case-sensitive; otherwise, it is case-insensitive. If the match succeeds, regexp() returns a list of the matches in string, or zero if it did not match. If regexp is not a valid regular expression the error ~regexp is thrown.
For more information on Regular Expressions see the section ColdC Regular Expressions. The function match_regexp() is similar, and better when all that is desired is whether the regexp matches or not. Examples:
regexp("fooBAR", "bar")
=> ["BAR"]
regexp("Greg says, 'Hello.'", "^([^ ]+) says, '(.*)'$")
=> ["Greg", "Hello."]
regexp(" 300 100 200 ", "[0-9]+")
=> ["300"]
regexp("bar", "foo")
=> 0
regexp("Foo", "foo", 1)
=> 0
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