问题
I'm looking to validate an URL. I have already a script that validates to not allow www. and http:// but i need to also validate for .co.uk .com etc.
My script won't run if they enter something like example.co.ukff.
I have this for a full URL:
^[a-zA-Z]+[:\/\/]+[A-Za-z0-9\-_]+\\.+[A-Za-z0-9\.\/%&=\?\-_]+$/i
I just need to validate the end .co.uk or .com etc.
回答1:
Try This...
/^http:\/\/|(www\.)?[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(:[0-9]{1,5})?(\/.*)?$/
It's working exactly what you want.
it takes with or with out http://, https://, and www.
回答2:
Far from pretending this to be the ideal regex to match urls, the particular problem of only matching urls which do not begin with www can be resolved with a negative lookahead : (?!www\.)
meaning that the following text should not be www.
Therefore, your regex adapted with this negative lookahead:
^(?!www\.)[A-Za-z0-9_-]+\.+[A-Za-z0-9.\/%&=\?_:;-]+$
matches the following urls
google.com
google.com/
goggle.com/q
google.com/q?q=1&h=en
google.co.uk
google.co.uk/
goggle.co.uk/q
google.co.uk/q?q=1&h=en
w.google.com
w.google.com/
w.goggle.com/q
w.google.com/q?q=1&h=en
209.85.149.105
209.85.149.105/
209.85.149.105/q
209.85.149.105/q?q=1&h=en
209.85.149.105:80
209.85.149.105:80/
209.85.149.105:80/q
209.85.149.105:80/q?q=1&h=en
example.domain.bogus.number.of.subdomains/index.htm
but not those:
www.google.com
www.google.com/
www.google.co.uk
www.google.co.uk/
www.google.co.uk/q
www.google.co.uk/q?q=1&h=en
http://209.85.149.105/
http://209.85.149.105:80/
http://www.google.com
https://www.google.com
http://google.com
https://google.com
来源：https://stackoverflow.com/questions/4691070/validate-url-without-www-or-http