simple regex: multiple dots(.)

I am trying to delete everything after the .com, .etc, in a URL; to make it more meaningful

so

sub.domain.com/324fr9?=awerf?=awrf

turns to

sub.domain.com/

except the same regex doesn't work for

noSubDomain.com/crap?=yes123456789timesOver

because it only has one dot, not two!

Here's my regex(javascript):

/.*:\/\开发者_如何学编程/.*\..*\.com/g

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If you are segmenting the URL and you want to do it in perl CPAN's URI module might be a better option. $uri->host is what you want, but you can do many other things using URI module.

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Javascript has the window.location object which is better to use for getting URL information - http://www.w3schools.com/jsref/obj_location.asp

Else, you could just design your regex to delete everything after the / instead.

url = url.replace(/\/.*/g, "/");

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/.*:\/\/(.*\.)?.*\.com/g

Here's the part that matters: (.*\.)? The question mark says that everything in that group is optional.