Extend String with trim functions

November 02, 2009 Javascript Regular expressions Nils Snippet

This is a neat Javascript extension to the String object contributed by Nils Forsman.

Here's the code that adds trim, ltrim and rtrim to the String object:

String.prototype.trim = function() {
  return this.replace(/(^\s*)|(\s*$)/g, '');
};

String.prototype.ltrim = function() {
  return this.replace(/^\s*/g, '');
};

String.prototype.rtrim = function() {
  return this.replace(/\s*$/g, '');
};

And a little code snippet to test the above functions:

var testString = " test ";
testString = testString .trim();
alert("#" + testString + "#");

Extend String with trim functions

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