Cache regex evaluation in i3.go

internal/lib/i3.go

@@ -154,18 +154,16 @@ func HasWindows(className string, instanceName string) bool {
 func FindWindowInstance(regexpStr string) bool {
 	var found = false
 
+	re, err := regexp.Compile(regexpStr)
+	if err != nil {
+		log.Printf("Unable to perform regexp match: %s", err)
+
+		return false
+	}
+
 	f := func(key any, value any) bool { //nolint: revive
 		keyStr := reflect.ValueOf(key).String()
 
-		re, err := regexp.Compile(regexpStr) // we do not want shit our pants and panic on
-		//        erroneous regexp, we want log it to stderr, that it.
-
-		if err != nil {
-			log.Printf("Unable to perform regexp match: %s", err)
-
-			return true
-		}
-
 		if re.Match([]byte(keyStr)) { //nolint:mirror
 			found = true
 
@@ -185,18 +183,16 @@ func FindWindowInstance(regexpStr string) bool {
 func FindWindowClass(regexpStr string) bool {
 	var found = false
 
+	re, err := regexp.Compile(regexpStr)
+	if err != nil {
+		log.Printf("Unable to perform regexp match: %s", err)
+
+		return false
+	}
+
 	f := func(key any, value any) bool { //nolint: revive
 		keyStr := reflect.ValueOf(key).String()
 
-		re, err := regexp.Compile(regexpStr) // we do not want shit our pants and panic on
-		//        erroneous regexp, we want log it to stderr, that it.
-
-		if err != nil {
-			log.Printf("Unable to perform regexp match: %s", err)
-
-			return true
-		}
-
 		if re.Match([]byte(keyStr)) { //nolint:mirror
 			found = true