feat: use regex to match no strstr

src/common/util.h

@@ -1,5 +1,7 @@
 /* See LICENSE.dwm file for copyright and license details. */
 
+
 void die(const char *fmt, ...);
 void *ecalloc(size_t nmemb, size_t size);
 int fd_set_nonblock(int fd);
+int regex_match(const char *pattern_mb, const char *str_mb);