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  1. <?php
  2.  
  3. $str='<li>Smartphone: Da</li>
  4.       <li>Touchscreen: Da</li>
  5.       <li>Tastatura QWERTY: Nu</li>
  6.       <li>Tip tastatura: Standard</li>
  7.       <li>Rezolutie senzor (Mp): 5</li>
  8.       <li>SAR (W/kg ): 1.17</li>';
  9.  
  10. print preg_replace('/<li\b[^>]*>\K[^<:]+(?=:)/i', '<strong>$0</strong>', $str);
Success #stdin #stdout 0.01s 20568KB
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Standard input is empty
stdout
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<li><strong>Smartphone</strong>: Da</li>
      <li><strong>Touchscreen</strong>: Da</li>
      <li><strong>Tastatura QWERTY</strong>: Nu</li>
      <li><strong>Tip tastatura</strong>: Standard</li>
      <li><strong>Rezolutie senzor (Mp)</strong>: 5</li>
      <li><strong>SAR (W/kg )</strong>: 1.17</li>
https://ideone.com/MSv8NA
language:
PHP (php 7.3.5)
created:
11 years ago
visibility:
public

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