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@ 2016-12-17T05:06:44Z

<?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
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)

preferences:dark modelive previewkey bindings

24.31 ms | 404 KiB | 5 Q