CODEWITHSUNDEEP
pythonregexregex-negationregex-lookarounds
ocean800
ocean800

Reputation: 3717

Regex - forbidding a certain string

So I'm new to regex and trying to write a regex that will match this: 

example.com/some-url-text-here/

but not something like 

example.com/some-url-text/but-also-more-than-two-slashes/
example.com/text-here/one-slash-too-many/two-slashes-too-many/

Basically, I would like it to match a url that has some string-separated-by-dashes surrounded by no more than two /'s.

I tried a couple of different things like negative look around or not.... last thing I tried was this: 

example\.com/[a-zA-z]*-*/

[a-zA-z]*-* matches something like text-here, but I can't get it to match /text-here/.. what am I doing wrong in this case?

Upvotes: 0

Views: 83

Answers (3)

Skycc
Skycc

Reputation: 3555

try regex below with lookahead, it will asserted no more backslash come after the 2nd

example\.com\/[a-zA-Z-]+[a-zA-Z]\/(?!.*\/)

demo

Upvotes: 2

double_j
double_j

Reputation: 1706

The reason your regex isn't working is because of the order you have it in.

example\.com/[a-zA-z]*-*/

This is looking for text UPPER and lower and THEN hyphens. Just include the hyphens in the brackets like so:

example\.com/[a-zA-z-]*/

Upvotes: 1

Eric Duminil
Eric Duminil

Reputation: 54223

If you have problems with regexen, you could simply split around "/", make sure that the elements aren't empty (except possibly the last one) and that there aren't more than 3 elements.

You can use -1 as parameter, to make sure the last elements are split:

>>> "some/url//".split("/", -1)
['some', 'url', '', '']

Upvotes: 1

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