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  1. <?php
  2.  
  3. $html = '
  4.   <a href="http://w...content-available-to-author-only...e.net/index.php?p[some stuff to find]/1/">
  5.   <a href=\'http://w...content-available-to-author-only...e.net/index.php?p[more stuff to find]/1/ \'>
  6.   <a href = http://w...content-available-to-author-only...e.net/index.php?p[unquoted_stuff_to_find]/1/ />
  7. '; 
  8.  
  9. $ref_txtstart = 'http://w...content-available-to-author-only...e.net/index.php?p';
  10. $ref_txtend   = '/1/';
  11.  
  12. $regex =
  13. '~
  14. <a 
  15.   (?=\s) 
  16.   (?= (?:[^>"\']|"[^"]*"|\'[^\']*\')*? (?<=\s) href \s*=
  17.     (?|
  18.         (?>
  19.            \s* ([\'"]) \s*
  20.            ' . preg_quote($ref_txtstart) . ' ((?:(?!\g{-2}).)*) ' . preg_quote($ref_txtend) . '
  21.            \s* \g{-2}
  22.         )
  23.       |
  24.         (?> 
  25.            (?!\s*[\'"]) \s* ()
  26.            ' . preg_quote($ref_txtstart) . ' ([^\s>]*) ' . preg_quote($ref_txtend) . '
  27.            (?=\s|>)
  28.         )
  29.     )
  30.   )
  31.   \s+ (?:".*?"|\'.*?\'|[^>]*?)+ 
  32. >~xs
  33. ';
  34.  
  35. echo ("$regex\n");
  36. preg_match_all( $regex, $html, $matches, PREG_SET_ORDER );
  37. foreach ($matches as $val) {
  38.    echo( "matched = $val[0]\ncore    = $val[2]\n\n"  );
  39. }
  40. ?>
  41.  
Success #stdin #stdout 0.02s 13232KB
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Standard input is empty
stdout
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~
<a 
  (?=\s) 
  (?= (?:[^>"']|"[^"]*"|'[^']*')*? (?<=\s) href \s*=
    (?|
        (?>
           \s* (['"]) \s*
           http\://www\.exemple\.net/index\.php\?p ((?:(?!\g{-2}).)*) /1/
           \s* \g{-2}
        )
      |
        (?> 
           (?!\s*['"]) \s* ()
           http\://www\.exemple\.net/index\.php\?p ([^\s>]*) /1/
           (?=\s|>)
        )
    )
  )
  \s+ (?:".*?"|'.*?'|[^>]*?)+ 
>~xs

matched = <a href="http://w...content-available-to-author-only...e.net/index.php?p[some stuff to find]/1/">
core    = [some stuff to find]

matched = <a href='http://w...content-available-to-author-only...e.net/index.php?p[more stuff to find]/1/ '>
core    = [more stuff to find]

matched = <a href = http://w...content-available-to-author-only...e.net/index.php?p[unquoted_stuff_to_find]/1/ />
core    = [unquoted_stuff_to_find]
https://ideone.com/IHHLg
language:
PHP (php 7.3.5)
created:
13 years ago
visibility:
public

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