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  1. <?php
  2.  
  3.  
  4.  
  5. $str = '.class { width: 10px !important } .class2 {max-width:100px;} .class3 { width: 20px; } .class4 { width: 20%; }';
  6.  
  7. preg_match_all('~(?<!-)width:\h*\K\d+(?=px)~', $str, $arr);
  8.  
  9. print_r($arr[0]);
Success #stdin #stdout 0.02s 24448KB
comments (?)
stdin 
Standard input is empty
stdout 
Array
(
    [0] => 10
    [1] => 20
)
https://ideone.com/PxMiOb
language:
PHP (php 7.3.5)
created:
5 years ago
visibility:
public

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