3v4l.org

run code in 300+ PHP versions simultaneously
<?php $regexEncoding = 'UTF-32'; mb_regex_encoding( $regexEncoding ); var_export( mb_ereg_replace( mb_convert_encoding( '(.+)', $regexEncoding ), mb_convert_encoding( "the \\1", $regexEncoding ), mb_convert_encoding( 'dog', $regexEncoding ) ) );

preferences:
66.18 ms | 402 KiB | 5 Q