PHPCS 4.x | Tokenizer/PHP: defer to predefined regex

Author: jrfnl

src/Tokenizers/PHP.php

@@ -888,7 +888,7 @@ protected function tokenize($string)
 
             if ($tokenIsArray === true
                 && ($token[0] === T_STRING
-                || preg_match('`^[a-zA-Z_\x80-\xff]`', $token[1]) === 1)
+                || preg_match(self::PHP_LABEL_REGEX, $token[1]) === 1)
             ) {
                 // Get the next non-empty token.
                 for ($i = ($stackPtr + 1); $i < $numTokens; $i++) {