<?php $str = '1st blah blah <!-- CONTACT FORM START [CONTACT_FORM_1] -->some form goes here<!-- CONTACT FORM END 1 --> 2nd blah blah <!-- CONTACT FORM START [CONTACT_FORM_2] -->another form goes here<!-- CONTACT FORM END 2 -->'; $pattern = '/<!-- CONTACT FORM START \[CONTACT_FORM_(\d+)\] -->.*<!-- CONTACT FORM END \1 -->/'; $replace = preg_replace($pattern, '[CONTACT_FORM_$1]', $str); echo $replace;
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