Javascript - kill white space in front of string

Question

I making some server reguests and the server reply me with a string that has a lot of spaces in front of the string. the string is USERNAME EXIST

I know how to use this:

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

String.prototype.reduceWhiteSpace = function() {
return this.replace(/\s+/g, ' ');};

but the first the first answer me USERNAMEEXISTS and the second on " USERNAME EXIST"(with one space in front of the string). Is there any way to kill all white spaces before and after the string?

see stackoverflow.com/questions/498970/…

Musa
– Musa

2012-07-31 23:23:37 +00:00
Commented Jul 31, 2012 at 23:23 — Musa
– Musa, Commented Jul 31, 2012 at 23:23

Paul · Accepted Answer · 2012-07-31 23:24:04Z

1

Use ^ to match the start of a string and $ to match the end of it in a regular expression:

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

Normally stripping whitespace is called trimming and is already implemented natively in modern browsers. So you may want to use this:

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

Which will create a shim for trim if it doesn't already exist, otherwise it will leave the native implementation (which is much faster) in place.

answered Jul 31, 2012 at 23:24

Paul

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Comments

Zach Shipley · Accepted Answer · 2012-07-31 23:30:45Z

0

String trimming is an interesting subject. Some browsers can optimize certain regular expressions better than others. Here's a good article: http://blog.stevenlevithan.com/archives/faster-trim-javascript

I normally use the first method from that article:

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

Note that this article (and this solution) focuses on performance. That may or may not be important to you, and other answers here will certainly fit the bill.

edited Jul 31, 2012 at 23:30

answered Jul 31, 2012 at 23:22

Zach Shipley

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