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  1. <?php
  2.  
  3. $str = '<div  class="col-sm-1 hidden-xs text-right" id="clsfd_registration_4371472">';
  4.  
  5. echo preg_replace('/(?<=\bid="clsfd_registration)_\d{7}(?=")/', '', $str);
Success #stdin #stdout 0.01s 20568KB
comments (?)
stdin 
Standard input is empty
stdout 
<div  class="col-sm-1 hidden-xs text-right" id="clsfd_registration">
https://ideone.com/hLdaOZ
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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