Rework the regexp (1024 false positive to... 0 on ux.symfony.com)

Author: smnandre

src/Icons/src/Twig/IconFinder.php

@@ -35,11 +35,14 @@ public function icons(): array
     {
         $found = [];
 
+        // https://regex101.com/r/WGa4iF/1
+        $token = '[a-z0-9]+(?:-[a-z0-9]+)*';
+        $pattern = "#(?:'$token:$token')|(?:\"$token:$token\")#i";
+
         foreach ($this->files($this->twig->getLoader()) as $file) {
             $contents = file_get_contents($file);
-
-            if (preg_match_all('#["\']([\w:-]+)["\']#', $contents, $matches)) {
-                $found[] = $matches[1];
+            if (preg_match_all($pattern, $contents, $matches)) {
+                $found[] = array_map(fn ($res) => trim($res, '"\''), $matches[0]);
             }
         }