How to get only digits between two strings with regex?

September 8, 2022

We have urls in the following URL formats, I want to get only digit values between the strings I specified, I tried a pattern like this (?<=\/sub.example.com\/)(.*)(?=\?[Uu]rl|$) but it does not give the result I want

https://sub.example.com/79084/t/64931?Url=https%3a%2f%2fwww.test.com%2fpath%2fotherpath%2f
https://sub.example.com/79084/t/64931

Expected results:
[ 79084, 64931 ]

I need to exclude /t/

https://regexr.com/6ti8p

>Solution :

Using dynamic length lookbehind feature in Javascript, you can use this regex:

(?<=\/sub\.example\.com\/(?:[^\/]*\/)*)\d+(?=(?:\/[^\/]*)*(?:\?[Uu]rl|$))

RegEx Demo

Note that it will match all the digits after domain name e.g. https://sub.example.com/79084/t/64931/1234/6789 will have 4 matches for all the numbers.

RegEx Breakup:

(?<=\/sub\.example\.com\/(?:[^\/]*\/)*): Lookbehind to assert presence of sub.example.com/ followed by 0 or more repeats of path components separated with /
\d+: Match 1+ digits
(?=(?:\/[^\/]*)*(?:\?[Uu]rl|$)): Must be followed by 0 or more repeats of path components separated with / and that must be followed by ?Url or line end.