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  1. <?php
  2.  
  3. $re = "#(-start|(?!^)\G)(.*?)FIND(?=.*end-)#"; 
  4. $str = "somes text -start bla bla FIND bla bla bla FIND bla FIND bla end-"; 
  5. $subst = "$1$2NEW_WORD"; 
  6. $result = preg_replace($re, $subst, $str);
  7. echo $result;
Success #stdin #stdout 0.02s 52432KB
comments (?)
stdin 
Standard input is empty
stdout 
somes text -start bla bla NEW_WORD bla bla bla NEW_WORD bla NEW_WORD bla end-
https://ideone.com/30BGZt
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
public

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