CODEWITHSUNDEEP
phpregexpcre
Vintage12
Vintage12

Reputation: 105

Regex excluding string

I am using the following PCRE to match URLS with preg_match() in PHP:

~(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))~

I'm trying to exclude .onion sites from being matched. I've noticed some similar questions already answered on this site but unfortunately wasn't able to transfer their solutions to my problem.

So far i have tried:

~(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))(?!\.onion)~

and: 

~(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))(?:(?!\.onion).)~

with no luck (both still match http://test.onion ). Would anyone be able to point out why these aren't working?

Upvotes: 1

Views: 190

Answers (2)

Avinash Raj
Avinash Raj

Reputation: 174696

Add a negative lookahead at the start.

(?i)(?!.*\.onion(?!\S))\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))

DEMO

Note that this regex would match http://test.onion.foo but not the links which has .onion at the end.

Upvotes: 1

anubhava
anubhava

Reputation: 784958

You can insert this negative lookahead at start of your regex:

(?!.*?\.onion)

i.e.

~(?i)\b(?!.*?\.onion)((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))~

Upvotes: 2

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