Nodejs Utililty Methods String Sub String

String.prototype.subStrs = function() {
  var output = [];
  for( var i = 0; i < this.length; i++ ) {
    for( var j = 0; j <= this.length; j++ ) {
      if(i < j) {
        output.push(this.substring(i,j));
    };
  };
...

String.prototype.subst = function(replacements) {
    return this.replace(/%[A-Z][A-Z0-9_]+%/g, function (placeholder) {
        return placeholder in replacements ? replacements[placeholder] : placeholder;
    });
};

String.prototype.subst = function (replacements) {
    "use strict";
    return this.replace(/%[A-Z][A-Z0-9_]+%/g, function (placeholder) {
        return placeholder in replacements ? replacements[placeholder] : placeholder;
    });
};

String.prototype.substitute = function(object, regexp){
  return String(this).replace(regexp || (/\\?\{([^{}]+)\}/g), function(match, name){
    if (match.charAt(0) == '\\') return match.slice(1);
    return (object[name] !== null) ? object[name] : '';
  });
};

String.prototype.substr = function(begin, end) {
  if (end === null) { end = this.length;           }
  if (begin <  0)   { begin = this.length + begin; }
  if (end <= 0)     { end = this.length + end;     }
  if (begin < 1)    { begin = end - 1/begin;       }
  if (end < 1)      { end = begin + 1/end;         }
  return this.substring(begin, end);

String.prototype.substr = function(start, length) {
  if (start < 0) {
    start = start + this.length;
  if (!length) {
    length = this.length - start;
  var s = "";
  for (var i = start, len = this.length; i < start + length && i < len; i+) {
...

String.prototype.substrCount = function(needle){
  var cnt = 0;
  for (var i=0;i<this.length;i++) {
  if (needle == this.substr(i,needle.length))
    cnt++;
  return cnt;
};

String.prototype.substrReplace = function(replaceWith, start, length){
  return this.replace(this.substring(start, (start+length)), replaceWith );
};

String.prototype.substrWoR = function(c){
  var n=1,o=0;
  while(o!=n){
    s=this.substr(0,c+(o=n)-1);
    n=s.split("\r").length;
  return s;

String.prototype.substrb = function(len){
  var str1;
  if(this.lengthb() <= len)
    return this;
  for(var i = len/2; i < this.length; i++)
    str1 = this.substr(0,i);
...