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emacselisp

Elisp: can't get matched group from regex

Code:

(if 
      (string-match-p "\\(.*\\)/www/sites" 
                      "/var/www/lwt/www/sites/all/modules/bundles/bundles.module")
      (match-string-no-properties 1 
                      "/var/www/lwt/www/sites/all/modules/bundles/bundles.module")
      "false"
)

Here I expected to get "/var/www/lwt", but I get nil. What is wrong?

Solution

  • As its docstring tells you:

    string-match-p is a compiled Lisp function in `subr.el'.

    (string-match-p REGEXP STRING &optional START)

    Same as `string-match' except this function does not change the match data.

    So you should be using string-match.