3v4l.org

run code in 300+ PHP versions simultaneously
<?PHP const pattern = "#\{(?:(?<name>\w+))(?:/\}|\}(?<snippet>(?:[^{]*|(?!\{\w+:\})|(?R))*)\{end\})#mu"; $ss = <<<'EOD' {first} {second}within second{end} {end} EOD; function testRun($input ){ echo $input[0]; echo PHP_EOL; } preg_replace_callback( pattern ,'testRun',$ss);
Output for 5.6.0 - 5.6.29, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
{first} {second}within second{end} {end}
preferences:
178.38 ms | 403 KiB | 222 Q