Here you can find the source of lTrim()
String.prototype.lTrim = function() { return this.replace(/(^[\\s]*)/g, ""); }
String.prototype.ltrim = function (charlist) { charlist = !charlist ? ' \\s\u00A0' : (charlist + '').replace(/([\[\]\(\)\.\?\/\*\{\}\+\$\^\:])/g, '$1'); var re = new RegExp('[' + charlist + ']+$', 'g'); return this.replace(re, ''); };
String.prototype.trimLeft = function() { return this.replace(/^\s+/, ''); };
String.prototype.trimLeft = String.prototype.trimLeft || function() { return this.replace(/^\s+/,''); };
String.prototype.trimLeft = function (character) { character = character || ' '; return this.replace(new RegExp('^[' + character + ']+'), ""); };
String.prototype.trimLeft = function(charlist = '\s') { return this.replace(new RegExp('^[' + charlist + ']+'), ''); };
String.prototype.lTrim = function(){ str = this; var i; for(i=0;i<str.length;i++) if(str.charAt(i)!=" "&&str.charAt(i)!=" ")break; str=str.substring(i,str.length); return str; ...
String.prototype.lTrim = function() { return this.replace(/(^\s*)/g, ""); };
String.prototype.lTrim = function () { var $whitespace = new String(" \t\n\r"); if ($whitespace.indexOf(this.charAt(0)) != -1) { var $i = this.length; var $j = 0; while ($j < $i && $whitespace.indexOf(this.charAt($j)) != -1) { $j++; return this.substring($j, $i); ...
String.prototype.lTrim = function(charlist) { if (charlist === undefined) charlist = "\s"; return this.replace(new RegExp("^[" + charlist + "]+"), ""); };