HTTP validation regexp, possible solution


#1

There was an old email thread from the end of January 2006 discussing
regular expressions for matching URLs. I took some of the sample
expressions and tweaked them a bit to the point where I think they
are pretty useful. They pass all of my tests anyway. :slight_smile:

For a reminder, here’s a sample message from that thread. My code is
below it.

On Jan 26, 2006, at 5:28 AM, Nathaniel S. H. Brown wrote:

> Subject: Re: [Rails] [ANN] HTTP URL validation plugin
>>
> http://username:removed_email_address@domain.invalid/?q=r&me=you#some_id
>
> Sorry, my REGEX skills are quite poor..
>
> Jeroen

Nathaniel’s expression almost worked. It didn’t match properly on
URLs that contained a port designation and it failed to match if a
URL didn’t have ‘.com’ or similar on the end of the host (like http://
localhost). Here’s an expression that’s working pretty well for me.
Thanks to Nathaniel’s work, and others, it didn’t take me as much
effort as I feared.

/^([A-Za-z.±]+)://([a-z0-9]+:[a-z0-9]+@)?[a-z0-9]+([-.]{1}[a-
z0-9]+)(.[a-z]{2,5})?(([:0-9]{1,5})?/.)?$/ix

I hope this is useful to somebody. If you make any further
improvements, please post them back to the list!

cr