正则表达式，匹配没有“http：//”的URL和任何其他“/”

Question

I looked around for a while, but probably I can't "Google" with the proper keywords.. so I'm here. I need to match an url stripping out protocol to first /

Target: match the first substring from http:// to first / (maybe last / don't exist) or to the end And here come a problem:

i wrote this regex

(?<=//)(.*?)(?=/)

but this regex matches only url with at least 1 '/' in the end excluding the protocol..

here some url to be matched:

• http:// www.google.com / (matched by my regex)
• http:// www.google.com
• https:// www.google
• xxx:// www.google.com /hello/bleh blah....../
• xxx:// google.com
• google.com /blah/hello.php?x=11_x.hi

Answer 1

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

（Java的双反斜杠）似乎适用于所有示例，包括简单的www.google.com

Answer 2

Something like...

^(https?:\/\/)?([0-9a-zA-Z][-\w]*[0-9a-zA-Z\.)+[a-zA-Z]{2,6})\/

I saw this in a book I had. That should account for a variable http/https, disallow whitespace, and probably stop at the first slash.

Comment if I did this wrong.

Answer 3

This is working for all your example but the last:

(?<=//)[^/\\s]+

[^/\\\\s] is a negated character class matching every character except / and \\s (whitespace, eg a space, tab or newline characters)

See it here on Regexr

What will not work is the last row. How do you want to decide what is a link? If I make the first part optional, it will match on every character except / and whitespaces.

Answer 4

It seems like you have the right answer, but you're missing the possibility of not having a trailing "/". Try this:

(?<=//)(.*?)(?=/|$)