reintroduce regexrules patch

regexrules/regexrules.patch

@@ -0,0 +1,64 @@
+diff --git a/config.def.h b/config.def.h
+index db0babc..ff23b6f 100644
+--- a/config.def.h
++++ b/config.def.h
+@@ -25,6 +25,7 @@ static const Rule rules[] = {
+ 	{ "Gimp",     NULL,       0,            1,           -1 },
+ 	*/
+ 	{ "firefox",  NULL,       1 << 8,       0,           -1 },
++	{ "^kitty$",  NULL,       0,            0,           -1 },
+ };
+ 
+ /* layout(s) */
+diff --git a/dwl.c b/dwl.c
+index ef27a1d..df29577 100644
+--- a/dwl.c
++++ b/dwl.c
+@@ -10,6 +10,7 @@
+ #include <sys/wait.h>
+ #include <time.h>
+ #include <unistd.h>
++#include <regex.h>
+ #include <wayland-server-core.h>
+ #include <wlr/backend.h>
+ #include <wlr/backend/libinput.h>
+@@ -327,6 +328,7 @@ static Monitor *xytomon(double x, double y);
+ static void xytonode(double x, double y, struct wlr_surface **psurface,
+ 		Client **pc, LayerSurface **pl, double *nx, double *ny);
+ static void zoom(const Arg *arg);
++static int regex_match(const char *pattern, const char *str);
+ 
+ /* variables */
+ static const char broken[] = "broken";
+@@ -430,8 +432,8 @@ applyrules(Client *c)
+ 		title = broken;
+ 
+ 	for (r = rules; r < END(rules); r++) {
+-		if ((!r->title || strstr(title, r->title))
+-				&& (!r->id || strstr(appid, r->id))) {
++		if ((!r->title || regex_match(r->title, title))
++				&& (!r->id || regex_match(r->id, appid))) {
+ 			c->isfloating = r->isfloating;
+ 			newtags |= r->tags;
+ 			i = 0;
+@@ -2746,6 +2748,19 @@ zoom(const Arg *arg)
+ 	arrange(selmon);
+ }
+ 
++int
++regex_match(const char *pattern, const char *str) {
++  regex_t regex;
++  int reti;
++  if (regcomp(&regex, pattern, REG_EXTENDED) != 0)
++    return 0;
++  reti = regexec(&regex, str, (size_t)0, NULL, 0);
++  regfree(&regex);
++  if (reti == 0)
++    return 1;
++  return 0;
++}
++
+ #ifdef XWAYLAND
+ void
+ activatex11(struct wl_listener *listener, void *data)
+