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Javascript Trim LTrim and RTrim Functions


This set of Javascript functions trim or remove whitespace from the ends of strings. These functions can be stand-alone or attached as methods of the String object. They can left trim, right trim, or trim from both sides of the string. Rather than using a clumsy loop, they use simple, elegant regular expressions. The functions are granted to the public domain.

Javascript Trim Member Functions

Use the code below to make trim a method of all Strings. These are useful to place in a global Javascript file included by all your pages.

String.prototype.trim = function() {
	return this.replace(/^s+|s+$/g,"");
String.prototype.ltrim = function() {
	return this.replace(/^s+/,"");
String.prototype.rtrim = function() {
	return this.replace(/s+$/,"");

// example of using trim, ltrim, and rtrim
var myString = " hello my name is ";

Javascript Trim Stand-Alone Functions

If you prefer not to modify the string prototype, then you can use the stand-alone functions below.

function trim(stringToTrim) {
	return stringToTrim.replace(/^s+|s+$/g,"");
function ltrim(stringToTrim) {
	return stringToTrim.replace(/^s+/,"");
function rtrim(stringToTrim) {
	return stringToTrim.replace(/s+$/,"");

// example of using trim, ltrim, and rtrim
var myString = " hello my name is ";

Free   Version: n/a   Platform(s): All   Updated:  July 23, 2008

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