- preg_replace: documentation ( source)
<?php
$subject = 'Fooo
<!-- NOCACHE_START DEV_PROFILING -->
<div class="box box-bdr pam mtm" id="dev_ProfilingButton">
<div class="h3">Profiling (<?php echo(round((microtime(true) - ALI
<!-- NOCACHE_END -->
bar';
$pattern = '/<!-- NOCACHE_START ([A-Za-z_]+)-->(.*)<!-- NOCACHE_END -->/sm';
$replace = '$1$2';
echo preg_replace($pattern, $replace, $subject);