The cleanLongWords() function presented in this page can be used to clean text with multiple consecutive characters and long words in JavaScript. Useful to clean texts that users add in input text fields or textarea.
By default, the function allows maximum 2 consecutive repetitions of characters in words, but not affects the numbers, and split the word to maximum 23 characters. See the comments in code, and example below.

Code of the cleanLongWords() function

- Click to select it.
function cleanLongWords(str, nrchr, maxword) {
// function to clean text with multiple consecutive characters and very long words ( https://coursesweb.net/ )
// nrchr = allowed number of consecutive character
// maxword = maximum word length
  if(!nrchr) var nrchr = 2;
  if(!maxword) var maxword = 23;
  var chr = ['q','w','e','r','t','y','u','i','o','p','a','s','d','f','g','h','j','k','l',';','z','x','c','v','b','n','m',',','!','@','#','%','&','_','=',':','"','`','~',';','â','á','é','í','ó','ú','ý','ø','č','ć','đ','š','ž','ā','ä','ǟ','ḑ','ē','ī','ļ','ņ','ō','ȯ','ȱ','õ','ȭ','ŗ','š','ț','ū','ž','ş','î','ă',"'",'$','\\^','\\*','\\(','\\)','\\{','\\}','\\|','\\?','\\.','\\[','\\]','\\/','\\\\','\\>','\\<'];

  // uncomment next line if you want to clean consecutive numbers too
///  chr.push('1','2','3','4','5','6','7','8','9','0');
  var n_chr = chr.length;

  function wordwrap(str, maxword, str_break, cut) {
    // Splits a string to a given number of characters: http://phpjs.org/functions/wordwrap/
    var m = ((arguments.length >= 2) ? arguments[1] : 75);
    var b = ((arguments.length >= 3) ? arguments[2] : '\n');
    var c = ((arguments.length >= 4) ? arguments[3] : false);
    var i, j, l, s, r;
    str += '';

    if (m < 1) return str;

    for (i = -1, l = (r = str.split(/\r\n|\n|\r/)).length; ++i < l; r[i] += s) {
      for (s = r[i], r[i] = ''; s.length > m; r[i] += s.slice(0, j) + ((s = s.slice(j)).length ? b : '')) {
        j = c == 2 || (j = s.slice(0, m + 1).match(/\S*(\s)?$/))[1] ? m : j.input.length - j[0].length || c == 1 && m || j.input.length + (j = s.slice(m).match(/^\S*/))[0].length;
      }
    }

    return r.join('\n');
  }

  for(var i=0; i<n_chr; i++) {
    var patern = new RegExp('(['+ chr[i] +']{'+ nrchr +',}){2,}', 'ig');
    str = str.replace(patern, '$1');
  }

  // if maxword > 0, split the word to specified number of characters
  return (maxword > 0) ? wordwrap(str, maxword, ' ', true) : str;
}

Example usage

<script>
// Here Add the cleanLongWords() function

var text = '\\\\\\\\\  A ttttttteeeeeeeeexxxxxxt with loooooonnnnnngggggg woooooooooooords and coooooonnnnnnsssssseeeeeeccccccuuuuuuttttttiiiiiivvvvvveeeeeee characteeeeeerrrrrrssssss [[[[[]]]]]] ///////......';

var text1 = cleanLongWords(text);
var text2 = cleanLongWords(text, 3);    // allow 3 consecutive repetitions of characters
var text3 = cleanLongWords(text, 1, 0);    // not consecutive characters, and not split the word

alert('text1 - '+ text1);
alert('text2 - '+ text2);
alert('text3 - '+ text3);
</script>
- Result:
text1 - \\ A tteexxt with loonngg woords and coonnsseeccuuttiivvee characteerrss [[]] //..
text2 - \\\\ A ttteeexxxt with looonnnggg wooords and cooonnnssseeecccuuuttti iivvveee characteeerrrsss [[[[[]]] ///...
text3 - \ A text with long words and consecutive characters [] /.

Live test



Result:
Here add some text. Will be cleaned keeping 2 consecutive characters and word to maximum 23 characters

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