Remove space using Trim, LTrim and RTrim using Regular Expressions

Monday, 19 December 2011 01:00

Trim: remove whitespace from the start and end(both sides) of the string.
LTrim: remove start whitespace of the string.
RTrim: remove end whitespace of the string.
Rather than using a clumsy loop, use a simple, elegant regular expression.



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:-



// example of using trim, ltrim, and rtrim

var myString = " hello my name is imdadhusen  ";

alert("*"+myString.trim()+"*");

alert("*"+myString.ltrim()+"*");

alert("*"+myString.rtrim()+"*");