[Performance] Remove regex for check start with big letter on ShortNa…

…meResolver (#5084)

rules/CodingStyle/ClassNameImport/ShortNameResolver.php

@@ -20,7 +20,6 @@
 use Rector\CodingStyle\NodeAnalyzer\UseImportNameMatcher;
 use Rector\Core\PhpParser\Node\BetterNodeFinder;
 use Rector\Core\PhpParser\Node\CustomNode\FileWithoutNamespace;
-use Rector\Core\Util\StringUtils;
 use Rector\Core\ValueObject\Application\File;
 use Rector\NodeNameResolver\NodeNameResolver;
 use Rector\NodeTypeResolver\Node\AttributeKey;
@@ -33,12 +32,6 @@
  */
 final class ShortNameResolver
 {
-    /**
-     * @var string
-     * @see https://regex101.com/r/KphLd2/1
-     */
-    private const BIG_LETTER_START_REGEX = '#^[A-Z]#';
-
     /**
      * @var array<string, string[]>
      */
@@ -174,7 +167,7 @@ private function resolveFromStmtsDocBlocks(array $stmts): array
                 static function ($node) use (&$shortNames) {
                     if ($node instanceof PhpDocTagNode) {
                         $shortName = trim($node->name, '@');
-                        if (StringUtils::isMatch($shortName, self::BIG_LETTER_START_REGEX)) {
+                        if (ucfirst($shortName) === $shortName) {
                             $shortNames[] = $shortName;
                         }