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JavaScript strip_tags function

A JavaScript equivalent of PHP’s strip_tags

strings/strip_tags.js raw on github
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function strip_tags(input, allowed) {
  //  discuss at: http://phpjs.org/functions/strip_tags/
  // original by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // improved by: Luke Godfrey
  // improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  //    input by: Pul
  //    input by: Alex
  //    input by: Marc Palau
  //    input by: Brett Zamir (http://brett-zamir.me)
  //    input by: Bobby Drake
  //    input by: Evertjan Garretsen
  // bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Onno Marsman
  // bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Eric Nagel
  // bugfixed by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
  // bugfixed by: Tomasz Wesolowski
  //  revised by: RafaƂ Kukawski (http://blog.kukawski.pl/)
  //   example 1: strip_tags('<p>Kevin</p> <br /><b>van</b> <i>Zonneveld</i>', '<i><b>');
  //   returns 1: 'Kevin <b>van</b> <i>Zonneveld</i>'
  //   example 2: strip_tags('<p>Kevin <img src="someimage.png" onmouseover="someFunction()">van <i>Zonneveld</i></p>', '<p>');
  //   returns 2: '<p>Kevin van Zonneveld</p>'
  //   example 3: strip_tags("<a href='http://kevin.vanzonneveld.net'>Kevin van Zonneveld</a>", "<a>");
  //   returns 3: "<a href='http://kevin.vanzonneveld.net'>Kevin van Zonneveld</a>"
  //   example 4: strip_tags('1 < 5 5 > 1');
  //   returns 4: '1 < 5 5 > 1'
  //   example 5: strip_tags('1 <br/> 1');
  //   returns 5: '1  1'
  //   example 6: strip_tags('1 <br/> 1', '<br>');
  //   returns 6: '1 <br/> 1'
  //   example 7: strip_tags('1 <br/> 1', '<br><br/>');
  //   returns 7: '1 <br/> 1'

  allowed = (((allowed || '') + '')
    .toLowerCase()
    .match(/<[a-z][a-z0-9]*>/g) || [])
    .join(''); // making sure the allowed arg is a string containing only tags in lowercase (<a><b><c>)
  var tags = /<\/?([a-z][a-z0-9]*)\b[^>]*>/gi,
    commentsAndPhpTags = /<!--[\s\S]*?-->|<\?(?:php)?[\s\S]*?\?>/gi;
  return input.replace(commentsAndPhpTags, '')
    .replace(tags, function($0, $1) {
      return allowed.indexOf('<' + $1.toLowerCase() + '>') > -1 ? $0 : '';
    });
}

Please note that php.js uses JavaScript objects as substitutes for PHP arrays, they are the closest match to this hashtable-like data structure.

Please also note that php.js offers community built functions and goes by the McDonald’s Theory. We’ll put online functions that are far from perfect, in the hopes to spark better contributions. Do you have one? Then please just:

Other PHP functions in the strings extension

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