2 * vim:ts=4:sw=4:expandtab
4 * i3 - an improved dynamic tiling window manager
5 * © 2009-2011 Michael Stapelberg and contributors (see also: LICENSE)
13 * Creates a new 'regex' struct containing the given pattern and a PCRE
14 * compiled regular expression. Also, calls pcre_study because this regex will
15 * most likely be used often (like for every new window and on every relevant
16 * property change of existing windows).
18 * Returns NULL if the pattern could not be compiled into a regular expression
19 * (and ELOGs an appropriate error message).
22 struct regex *regex_new(const char *pattern) {
26 struct regex *re = scalloc(sizeof(struct regex));
27 re->pattern = sstrdup(pattern);
28 if (!(re->regex = pcre_compile(pattern, 0, &error, &offset, NULL))) {
29 ELOG("PCRE regular expression compilation failed at %d: %s",
33 re->extra = pcre_study(re->regex, 0, &error);
38 * Checks if the given regular expression matches the given input and returns
39 * true if it does. In either case, it logs the outcome using LOG(), so it will
40 * be visible without any debug loglevel.
43 bool regex_matches(struct regex *regex, const char *input) {
46 /* TODO: is strlen(input) correct for UTF-8 matching? */
47 /* TODO: enable UTF-8 */
48 if ((rc = pcre_exec(regex->regex, regex->extra, input, strlen(input), 0, 0, NULL, 0)) == 0) {
49 LOG("Regular expression \"%s\" matches \"%s\"\n",
50 regex->pattern, input);
54 if (rc == PCRE_ERROR_NOMATCH) {
55 LOG("Regular expression \"%s\" does not match \"%s\"\n",
56 regex->pattern, input);
60 /* TODO: handle the other error codes */