javascript Regex for Absolute AND relative URl

Question

Is there any regex which will validate both an absolute URL and relateve URl for Javascript.

I do have following Regex which works fairly well for absolute URL except the part where it is making the HTTP part mandatory. I want it optional.

Here is Regex:

/(http|ftp|https):\/\/[\w-]+(\.[\w-]+)+([\w.,@?^=%&amp;:\/~+#-]*[\w@?^=%&amp;\/~+#-])?/;

thanks

A relative URL can be basically anything, so you'd have a tough time validating that — Explosion Pills
– Explosion Pills, Commented Feb 6, 2013 at 3:24

Arun P Johny · Accepted Answer · 2013-02-06 03:24:00Z

4

Try

/((http|ftp|https):\/\/)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&amp;:\/~+#-]*[\w@?^=%&amp;\/~+#-])?/;

It makes the (http|ftp|https):\/\/ (http://) portion optional

answered Feb 6, 2013 at 3:24

Arun P Johny

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1 Comment

Lost Over a year ago

Yes, it did make the HTTp part optional but still does not accept the relate path so it does acceprt www.google.com but it does not accept \page

williamli · Accepted Answer · 2020-11-12 09:46:42Z

1

The following should work:

/^(https?:\/\/|\/)\w+\.[^\s]+$|^\/[^\s]*$/

answered Nov 12, 2020 at 9:46

williamli

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Comments

Lenka Pitonakova · Accepted Answer · 2019-05-10 17:58:03Z

0

This one accepts things like:

http://example.com
https://example.com.com
/mypage
/my/page/

But not things like

httpa://example.com
my/page/
www

The regexp is:

/(^(https?:\/\/|\/)(?:www\.|(?!www))?[^\s])/

answered May 10, 2019 at 17:58

Lenka Pitonakova

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1 Comment

williamli Over a year ago

Your regex only matches the first character after https:// or http:// or /.

Rain Diao · Accepted Answer · 2013-02-07 01:35:31Z

-1

quick answer, modified Arun's answer to accept '/page', '/page/subpage', 'page/subpage'

/(\/?[\w-]+)(\/[\w-]+)*\/?|(((http|ftp|https):\/\/)?[\w-]+(\.[\w-]+)+([\w.,@?^=%&amp;:\/~+#-]*[\w@?^=%&amp;\/~+#-])?)/gi

but in actually, validate the url with RegExp is never esay. lots of edge case, like './page', '../page' etc.

analyse your requirement carefully, write down the major test cases, write a RegExp pass them all. and be careful with performance.

edited Feb 7, 2013 at 1:35

answered Feb 6, 2013 at 6:12

Rain Diao

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6 Comments

Lost Over a year ago

For some reason javascript editor does not recognize this string as valid Regex.

Rain Diao Over a year ago

whoops, I only posted the text part. should add / on each side. already updated the answer.

Lost Over a year ago

I actually did replace this new one with the old one and the problem here is that now it takes anything. It would also accept plain text as a valid URL :((

Rain Diao Over a year ago

because I think "plain text" is also a valid relative url. example: <a href="page_on_same_path"> or <a href="sub/page_on_sub_path">

shellscape Over a year ago

This regex will match a single word character as well. Not exactly useful for validating relatively urls. Arun's solution below does not have the same issue.

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