strip-tags.js

function strip_tags (input, allowed) { // eslint-disable-line camelcase

  //  discuss at: http://locutus.io/php/strip_tags/

  // original by: Kevin van Zonneveld (http://kvz.io)

  // improved by: Luke Godfrey

  // improved by: Kevin van Zonneveld (http://kvz.io)

  //    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://kvz.io)

  // bugfixed by: Onno Marsman (https://twitter.com/onnomarsman)

  // bugfixed by: Kevin van Zonneveld (http://kvz.io)

  // bugfixed by: Kevin van Zonneveld (http://kvz.io)

  // bugfixed by: Eric Nagel

  // bugfixed by: Kevin van Zonneveld (http://kvz.io)

  // bugfixed by: Tomasz Wesolowski

  //  revised by: Rafał 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://kvz.io'>Kevin van Zonneveld</a>", "<a>")

  //   returns 3: "<a href='http://kvz.io'>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'



  // making sure the allowed arg is a string containing only tags in lowercase (<a><b><c>)

  allowed = (((allowed || '') + '').toLowerCase().match(/<[a-z][a-z0-9]*>/g) || []).join('')



  var tags = /<\/?([a-z][a-z0-9]*)\b[^>]*>/gi

  var commentsAndPhpTags = /<!--[\s\S]*?-->|<\?(?:php)?[\s\S]*?\?>/gi



  return input.replace(commentsAndPhpTags, '').replace(tags, function ($0, $1) {

    return allowed.indexOf('<' + $1.toLowerCase() + '>') > -1 ? $0 : ''

  })

}