Regex to block ? parameter in url

Question

I have a pretty basic regex for a soundcloud link as follows:

/^(https?:\/\/)?((www)?\.)?soundcloud\.com\/[a-zA-Z0-9]*/

It doesn't do much and I would like to block that kind of more complicated links that contain something else (?fbclid=) than only valid soundcloud information:

Invalid:

https://soundcloud.com/beat-one/done-lam/w-avlwV?fbclid=IwAR8TyDI-1ezXHrP1BfaBG1rLP8gTlEQeGJzKO0DGZl7h1i63VWqenV_yDI8

Valid:

https://soundcloud.com/beat-one/done-lam/w-avlwV

How can I do it?

Thanks!

Do you mean like this? ^(https?:\/\/)?((www)?\.)?soundcloud\.com\/(?!.*\?fbclid=).*$ regex101.com/r/NRxwHz/1 Note that as www is optional is could also match .soundcloud — The fourth bird
– The fourth bird, Commented Dec 13, 2019 at 12:47
Thank you very much for your answer, it seems a little complicated to understant as i am quite a regex noob. Could you just specify that the link should not contain any ?character? — Wizzardzz
– Wizzardzz, Commented Dec 13, 2019 at 12:51

The fourth bird · Accepted Answer · 2019-12-13 12:57:03Z

2

Using a pattern like ((www)?\.)? matches optional www but could also match an optional .

I think you meant to use optional www. as a whole.

For the question mark part, you could match the beginning of the use and then use a negative lookahead (?!.*\?fbclid=) to assert what is on the right does not match ?fbclid=

If that is the case, you could match for example 0+ times a non whitespace char \S*

If you are not using the capturing groups for further processing, you could also make them non capturing (?:

^(https?:\/\/)?(www\.)?soundcloud\.com\/(?!.*\?fbclid=)\S*$

Regex demo

If the link should not contain a question mark, you could simplify the lookahead to (?!.*\?)

answered Dec 13, 2019 at 12:57

The fourth bird

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2 Comments

Wizzardzz Over a year ago

Thanks a lot, but https://soundcloud.com/beat-one/done-lam/w-avlwV?fbclid=IwAR8TyDI-1ezXHrP1BfaBG1rLP8gTlEQeGJzKO0DGZl7h1i63VWqenV_yDI8 still matches your regex unfortunately

The fourth bird Over a year ago

@Wizzardzz Did you check the regex demo? regex101.com/r/EHIfa5/1 How are you using the pattern? What is the tool or language?

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