less/dist/regexp.c

51  * regmust	string (pointer into program) that match must include, or NULL
52  * regmlen	length of regmust string
56  * of lines that cannot possibly match.  The regmust tests are costly enough
57  * that regcomp() supplies a regmust only if the r.e. contains something
256 	r->regmust = NULL;
271 		 * regmust.  Resolve ties in favor of later strings, since
284 			r->regmust = longest;
748 	if (prog->regmust != NULL) {
750 		while ((s = strchr(s, prog->regmust[0])) != NULL) {
751 			if (strncmp(s, prog->regmust, prog->regmlen) == 0)
1137 	if (r->regmust != NULL)
1138 		printf("must have \"%s\"", r->regmust);