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  1. <?php
  2.  
  3. $string = 'img[style*="float: left"]
  4. img: [style*="float: left"]
  5. img( [style*="float: left"]
  6. ';
  7.  
  8.  
  9.     $regex = '/"[^"]*"|([:(])\s+/ims';
  10.  
  11.     $output = preg_replace_callback(
  12.         $regex,
  13.         function ($matches) {
  14.             if (array_key_exists (1, $matches)) {
  15.                 return $matches[1] ;
  16.             }
  17.             return $matches[0];
  18.         },
  19.         $string
  20.     );
  21.     echo "this is the output:"  . $output;
Success #stdin #stdout 0.01s 20568KB
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stdin
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Standard input is empty
stdout
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this is the output:img[style*="float: left"]
img:[style*="float: left"]
img([style*="float: left"]
https://ideone.com/VEzSLK
language:
PHP (php 7.3.5)
created:
10 years ago
visibility:
secret

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