clean up regex

Author: samsonasik

rules/Php72/NodeFactory/AnonymousFunctionFactory.php

@@ -82,7 +82,6 @@ public function create(
     public function createAnonymousFunctionFromExpr(Expr $expr): ?Closure
     {
         $stringValue = $this->inlineCodeParser->stringify($expr);
-        $stringValue = $this->normalizeHexBackreferenceExpression($stringValue);
 
         $phpCode = '<?php ' . $stringValue . ';';
         $contentStmts = $this->simplePhpParser->parseString($phpCode);
@@ -126,24 +125,6 @@ public function createAnonymousFunctionFromExpr(Expr $expr): ?Closure
         return $anonymousFunction;
     }
 
-    private function normalizeHexBackreferenceExpression(string $stringValue): string
-    {
-        // Only rewrite when the expression has no quotes, to avoid mutating string literals.
-        if (str_contains($stringValue, "'") || str_contains($stringValue, '"')) {
-            return $stringValue;
-        }
-
-        return Strings::replace(
-            $stringValue,
-            '#0x(?<backreference>\\\d+|\$\d+)#',
-            static function (array $match): string {
-                $backreference = $match['backreference'];
-                $number = ltrim($backreference, '\\$');
-                return 'hexdec($matches[' . $number . '])';
-            }
-        );
-    }
-
     /**
      * @param Param[] $params
      * @return string[]

src/PhpParser/Parser/InlineCodeParser.php

@@ -53,9 +53,9 @@
     private const string BACKREFERENCE_NO_DOUBLE_QUOTE_START_REGEX = '#(?<!")(?<backreference>\$\d+)#';
 
     /**
-     * @see https://regex101.com/r/8Dk7Qn/1
+     * @see https://regex101.com/r/13mVVg/1
      */
-    private const string HEX_BACKREFERENCE_REGEX = '#0x(?<backreference>\\\d+|\$\d+)#';
+    private const string HEX_BACKREFERENCE_REGEX = '#0x(?<backreference>\$\d+)#';
 
     public function __construct(
         private BetterStandardPrinter $betterStandardPrinter,