I need to match a certain part of url path using Regex and Javascript

Question

I have the following link:

sitename.com/Default.aspx?PageID=13078494

I want to grab the following: "PageID=13078494". This is what I have so far:

var url = "sitename.com/Default.aspx?PageID=13078494";    
urlmatch = url.match([PageID=13078494]);
urlmatch[0];

Is this the proper expression for what I'm trying to do?

Just to check, are you trying to match any page ID, or specifically the page ID 13078494? From your example it's difficult to tell. We're all assuming (myself included) you meant that you want to match any page id. — Iain Fraser
– Iain Fraser, Commented Nov 12, 2012 at 2:53

Joseph Silber · Accepted Answer · 2012-11-12 02:38:05Z

2

Your regex and its syntax are wrong.

A better way would be to not use a regex at all. Use .split() instead:

var urlmatch = url.split('?')[1];

Here's the fiddle: http://jsfiddle.net/qpXNU/

answered Nov 12, 2012 at 2:38

Joseph Silber

221k59 gold badges369 silver badges292 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Iain Fraser · Accepted Answer · 2012-11-12 03:17:09Z

2

var myregexp = /[?&]PageID=(\d+)/i;
var match = myregexp.exec(url);
if (match != null) {
    //This is if your match it successful
    result = match[1];
} else {
    //This is if url doesn't match
    result = "";
}

This one will work regardless of where PageID is. It will match

sitename.com/Default.aspx?PageID=13078494
anything.org/Default.aspx?PageID=13078494
sitename.com/Default.aspx?foo=bar&PageID=13078494
sitename.com/Default.html?foo=bar&PageID=13078494&bar=foo
Default.html?foo=bar&PageID=13078494&bar=foo

Importantly, it WON'T match

sitename.com/Default.aspx?NotThePageID=13078494

Or without the checking, simply url.match(/[?&]PageID=(\d+)/i)[1], but I'd advice against that unless your SURE it will always match.

edited Nov 12, 2012 at 3:17

answered Nov 12, 2012 at 2:46

Iain Fraser

6,7488 gold badges45 silver badges68 bronze badges

3 Comments

Kelvin Over a year ago

+1 Good catch on ?$ - not sure what I was smoking to have missed that. One small problem: [?|&] matches | as well, since [] denotes a list of characters to match, unlike () where a pipe acts as an or separator.

Iain Fraser Over a year ago

Oops, thanks for the catch. Originally these were round braces and I made them square braces and forgot to remove the OR operator. ;)

Kelvin Over a year ago

Easily done - don't forget to change it in your second example too! Also just noticed you're grabbing match[0], which will contain the full matched text (PageID=13078494) - the first capture group ends up in match[1] :)

Kelvin · Accepted Answer · 2012-11-12 02:40:36Z

1

Try the following regex, which will extract the PageID and place it in the first match group:

var url = "sitename.com/Default.aspx?PageID=13078494";
urlmatch = url.match(/PageID=(\d+)/);
alert(urlmatch[1]); // 13078494

answered Nov 12, 2012 at 2:40

Kelvin

5,3171 gold badge27 silver badges37 bronze badges

Comments

Yogendra Singh · Accepted Answer · 2012-11-12 02:46:36Z

0

If you are matching specific value, then it's fine, otherwise use below to match any number of digits in pageID:

      /PageID=\d+/

as:

    var url = "sitename.com/Default.aspx?PageID=13078494";
    var urlmatch = url.match(/PageID=\d+/);
    alert(urlmatch[0]);

or to match 8 exact digits in pageID, use:

      /PageID=\d{8}/

as:

    var url = "sitename.com/Default.aspx?PageID=13078494";
    var urlmatch = url.match(/PageID=\d{8}/);
    alert(urlmatch[0]);

edited Nov 12, 2012 at 2:46

answered Nov 12, 2012 at 2:38

Yogendra Singh

34.5k7 gold badges66 silver badges73 bronze badges

Comments

user123444555621 · Accepted Answer · 2012-11-12 04:04:11Z

0

When it comes to handling URLs, the browser is pretty good.

You should convert your string to an actual URL like so:

var toURL = function (href) {
    var a = document.createElement('a');
    a.href = href;
    return a;
};

Now use the browser's built-in parsing capabilities:

var url = toURL('sitename.com/Default.aspx?PageID=13078494');
alert(url.search);

answered Nov 12, 2012 at 4:04

user123444555621

154k27 gold badges118 silver badges126 bronze badges

Collectives™ on Stack Overflow

I need to match a certain part of url path using Regex and Javascript

5 Answers 5

Comments

3 Comments

Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

5 Answers 5

Comments

3 Comments

Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related