Strong from to : only if there is a :

The only problem with this is that it makes text bold even if there is no :

Test it and you will see the problem.

<?php
  $str = '
	This should be bold: this should not be bold
	<p>Intro text: this is a test.</p>  
	<p>Hello world: How are you?</p>   
	<p>This text should not be bold because there is no colon. Test 123.</p>   
	<p>Foobar: Zooph.</p>';
 
  $str = preg_replace('/(^|<p>)([^:]+):/ims', '\1<strong>\2:</strong>', $str);
  echo $str;
  
?>

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