I have a problem with validating group 2 which is the (sub)domain and extension.
My regex: /^(http:[\/]{2})([\w\d\-\_\.]+)(\/(?:[\/\w\W]+)?)?$/
Issue on: ([\w\d\-\_\.]+)
Issue: http://www.....google....com/stuff is valid, I tried doing [\w\d\-\_][(?<!\.)\.(?!\.)]+ but alas it doesn't work.
How can I make it so that if there's a . behind or a . in front of a . that the regex will return false.
You can use a negative lookahead:
~^https?:/{2}(?!.*?\.\.)([\w\d.-]+)(/.*)?$~
btw in PHP you can also use parse_url function for parsing URLs.
(?!.*?\.\.) is a negative lookahead that will disallow 2 dots.
You can use this version of your regex:
^(http:[\/]{2})((?![^\/]*?\.{2}[^\/]*?)[\w\d\-\_\.]+)(\/(?:[\/\w]+)?)?$
The problem was with the \W (together with \w in the same character class) that matched everything, even a new line.
