Regex to matches a url with or without http in java

Question

I want to validate a url that is with or without http. i tried ^http(s{0,1})://[a-zA-Z0-9_/\\-\\.]+\\.([A-Za-z/]{2,5})[a-zA-Z0-9_/\\&\\?\\=\\-\\.\\~\\%]*

But this is matches http://google.com but not www.google.com. i want a regex that matches www.google.com too.

Thanks

use a library if you can: http://commons.apache.org/validator/apidocs/org/apache/commons/validator/routines/UrlValidator.html — Amir T, Dec 24 '12 at 04:45
If you research using regular expressions to match URLs you'll find that it is very difficult to create one that matches all cases. — Brian Roach, Dec 24 '12 at 04:58

score 3 · Answer 1 · answered Dec 24 '12 at 04:44

3

Try starting your regex with ^(https?://)? instead of ^http(s{0,1})://

answered Dec 24 '12 at 04:44

Ted Hopp

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score 2 · Accepted Answer · answered Dec 24 '12 at 04:45

^(?:https?://)? ... the rest of your regex

?: means do not capture group
? quantifier minification (match if exists, if not - omit it)

P.S. I'm not sure if quantifier minification makes sense to english native speakers, this is a rough translation from russian :) Hopefully, if I'm mistaken, somebody understands what I meant and could fix me.

Regex to matches a url with or without http in java

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