JavaScript regex to check URL with possible wildcard subdomain specifier

Question

I need a simple JavaScript regex that will validate all of the following

http://example.com
https://example.com
example.com
*.example.com
https://example.com
http://*.example.com
https://*.example.com

I use .com here by way of example but it could well be something else

but not, for example, https://*example.com. I thought the following

/((https?:\/\/)?([*]\.)?[a-z0-9_-]+(\.[a-z0-9_-]+)+\.?)/gi

might do the trick. It does, almost. The trouble is it passes `http://*example.com'. I fail to see why this is happening. Admittedly, regexes are not quite my forte.

hjpotter92 · Accepted Answer · 2015-11-05 07:08:12Z

1

I think the following should work:

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

This works for the given test cases.

answered Nov 5, 2015 at 7:08

hjpotter92

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