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  1. <?php
  2. $re = "/(\\w+)(?=\\s+\\d)/m"; 
  3. $str = "width 40cm height 70cm\nwidth: 40cm height 70cm"; 
  4.  
  5. $result = preg_replace($re, "$1:", $str);
  6. print_r($result);
Success #stdin #stdout 0.02s 52472KB
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stdin
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Standard input is empty
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width: 40cm height: 70cm
width: 40cm height: 70cm
https://ideone.com/PMpItt
language:
PHP (php 7.3.5)
created:
7 years ago
visibility:
public

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