Here you can find the source of lefttrim( )
// Trims the beinning white space from a string. String.prototype.lefttrim = function( ) { return( this.replace(new RegExp("^[\\s]+", "gm"), "") ); };
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 + "]+"), ""); };
String.prototype.leftTrim = function () { return this.replace(/^\s+/, "");
String.prototype.leftTrim = function() { return this.replace(/(^\s*)/g, "");
String.prototype.leftTrim =function(){ return this.replace(/^\s+/,'');
String.prototype.TrimStart = function( aimStr ) var str = this; var re = My.RegExp.InvolvedCharsRegExp; var reStart; if ( aimStr ) aimStr = aimStr.replace( re, '\\$1' ); reStart = new RegExp( '^(' + aimStr + ')+' ); ...
String.prototype.LTrim = function(){ return this.replace(/(^\s*)/g, ""); };
String.prototype.LTrim = function() { return this.replace(/^\s+/g, "");