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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: match string to regexp
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Miguel Frasson <frasson@brutus.math.leidenuniv.nl> writes:

> How to match a string against a regexp? The string is returned by
> some function like (match-string N).

,----[ C-h f string-match RET ]
| string-match is a built-in function.
| (string-match REGEXP STRING &optional START)
| 
| Return index of start of first match for REGEXP in STRING, or nil.
| Case is ignored if `case-fold-search' is non-nil in the current buffer.
| If third arg START is non-nil, start search at that index in STRING.
| For index of first char beyond the match, do (match-end 0).
| `match-end' and `match-beginning' also give indices of substrings
| matched by parenthesis constructs in the pattern.
| 
| You can use the function `match-string' to extract the substrings
| matched by the parenthesis constructions in REGEXP.
`----