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  1. <?php
  2.   $str = '<p>"bla" bla</p>';
  3.  
  4.   $new = preg_replace( '~(?<=^<p>)(\W*)(\w)(?=[\s\S]*</p>$)~i',
  5.                        '$1<span class="first_letter">$2</span>',
  6.                        $str );
  7.   echo $new."\n";
  8. ?>
  9.  
Success #stdin #stdout 0.02s 13112KB
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<p>"<span class="first_letter">b</span>la" bla</p>
https://ideone.com/v5KvL
language:
PHP (php 7.3.5)
created:
12 years ago
visibility:
public

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