JavaScript Regex question

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I have following function to check for invalid symbols entered in a text box and return true or false. How can I modify this function to also check for occurrences like http:// and https:// and ftp:// return false if encountered ?

function checkURL(textboxval) {
   return ! (/[<>()#'"]|""/.test(textboxval));
}

Thanks

do you wish to catch any protocol specifier or just those in particular? — Kyril
– Kyril, Commented Jun 11, 2010 at 15:42

Kyril · Accepted Answer · 2010-06-11 15:48:26Z

2

function checkURL(textboxval) {
   return ! (/[<>()#'"]|""|(https?|ftp)\:\/\//.test(textboxval));
}

answered Jun 11, 2010 at 15:48

Kyril

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1 Comment

Jake Over a year ago

How to check for case insensitive?

Andy · Accepted Answer · 2010-06-11 15:44:58Z

1

You want it to return false if it encounters a protocol?

function checkURL(textboxval) {
    return ! (/[<>()#'"]|""|(f|ht)tp(s)?:\/\//.test(textboxval));
}

This is a useful tool for figuring these things out also: RegexPal.

answered Jun 11, 2010 at 15:44

Andy

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4 Comments

Tomalak Over a year ago

I like the fact that (f|ht)tp(s)? the same length, but much harder to read and less efficient than (https?|ftp)… ;-) If you take non-capturing groups it even gets longer than the straight-forward variant.

Jake Over a year ago

Thanks.. This works fine.. It should return false even if the protocol is entered in CAPS.. But it returns true...

Andy Over a year ago

If you want it to be case-insensitive, end the regex with /i.

Andy Over a year ago

Tomalak, you're correct. I started with just http and then was mucking around in the tester and forgot to clean it up before posting here.

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