php - Storing a piece of the string for later use in replacement -

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It is not certain that the subject was clear, it is difficult to describe, easy to show:

It needs change: 

  $ text = '% textgroup% img_green% img_Red and some more text here';

To do this: 

  $ text = 'bunch of text & lt; Img src = "/ assets / images / green.gif" alt = "green" / & gt; & Lt; Img src = "/ assets / images / Red.gif" alt = "red" /> And some more text here ';

Thanks in advance. 

  $ text = preg_replace ('/% img _ (\ W +) / ',' & lt; img src = "/ assets / images / \ 1.jpg" alt = "\ 1" /> ", $ text);

Check how it's working


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