Rule ereg_to_preg Replace deprecated ereg regular expression functions with preg. Warning Using this rule is risky Risky if the ereg function is overridden. Examples Example #1 --- Original +++ New -<?php $x = ereg('[A-Z]'); +<?php $x = preg_match('/[A-Z]/D'); Rule sets The rule is part of the following rule sets: @PhpCsFixer:risky @Symfony:risky Source class PhpCsFixer\Fixer\Alias\EregToPregFixer