Simplify NoSuperfluousConcatenationFixer (#720)

Author: kubawerlos

src/Fixer/NoSuperfluousConcatenationFixer.php

@@ -181,24 +181,10 @@ private function getContentForBorder(string $content, string $targetBorder, bool
  $content = \str_replace('$', '\\$', $content);
 
  // escape double quote
- $pieces = \explode('\\\\', $content);
- $pieces = \array_map(
- static function (string $piece): string {
- $piece = Preg::replace(
- '/(?<=\\\\)"/',
- '\\\\\"',
- $piece
- );
-
- return Preg::replace(
- '/(?<!\\\\)"/',
- '\\"',
- $piece
- );
- },
- $pieces
+ return Preg::replace(
+ '/(?<!\\\\)((\\\\{2})*)(\\\\)?"/',
+ '$1\\\\$3$3"',
+ $content
  );
-
- return \implode('\\\\', $pieces);
  }
 }