regex to fetch url from string

Question

In php am doing one task -
I want such a regex which will fetch like

$str = "this is my friend's website http://example1.com I think it is coll some text example.com some text t.com/2000 some text rs.500 some text http://www some text"

how can I fetch following with the help of regex -

http://example1.com
example.com
t.com/2000
http://www

rs.500 must be avoided!

actually I need such a regex which can satisfy any link

please help me with that

@DanielDudas I have tried but it gives me only those urls which has https or http..... can you please help me out here I am still trying .... If I will get an answer I will definitely update it here .... — Progi1990
– Progi1990, Commented Oct 9, 2016 at 7:39
Sharing your research helps everyone. Tell us what you've tried and why it didn’t meet your needs. This demonstrates that you’ve taken the time to try to help yourself, it saves us from reiterating obvious answers, and most of all it helps you get a more specific and relevant answer! See also: How to Ask — Thomas Ayoub
– Thomas Ayoub, Commented Oct 9, 2016 at 11:19

user8397947 · Accepted Answer · 2016-10-09 14:03:43Z

This regex is what you're looking for (mandatory regex101 link):

(https?:\/\/\S+)|([a-z]+\.[a-z]+(?:\/\S+)?)

It's basically the two regexes https?:\/\/\S+ and [a-z]+\.[a-z]+(?:\/\S+)? placed into capturing groups (so that you can extract all URLs with a global search) and then combined with an OR.

https?:\/\/\S+ finds URLs that are prefixed with http:// or https:// by matching:

The string "http" literally http, followed by
An optional "s" s? followed by
A colon and two forward slashes :\/\/, followed by
One or more non-whitespace characters \S+

If https?:\/\/\S+ doesn't match, then [a-z]+\.[a-z]+(?:\/\S+)? kicks in and finds URLs that are not prefixed with http:// or https:// and whose top level domains don't contain numbers by matching:

One or more lowercase letters [a-z]+, followed by
A dot \., followed by
One or more lowercase letters [a-z]+, followed by
An optional group, which consists of
- A forward slash \/, followed by
- One or more non-whitespace characters \S+

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