JS regex not ending with

Question

I've following regex to match urls:

/(https?:\/\/[^"<\s]+[^.<\s"()][-A-Za-z0-9+&@#\/%=~_|])(?![^<>]*>|[^"]*?<\/a)/gi

Who match both urls:

http://example.fr/image.png
http://example.fr/image.pdf

This is a specific regex to our application, I want to keep it as it, but just add one functionality.

Question: I want to ignore urls ending with .png.

Is it possible?

L3viathan · Accepted Answer · 2017-12-14 13:38:42Z

2

Yes, it is possible.

Use a negative lookbehind at the end, and force it to match the entire string:

(https?:\/\/[^"<\s]+[^.<\s"()][-A-Za-z0-9+&@#\/%=~_|])(?![^<>]*>|[^"]*?<\/a)(?<!\.png)$

Try it online

The negative lookbehind (?<!\.png) is a zero-width match if the current position isn't preceeded by something matching \.png. $ forces the regex to match the entire line.

answered Dec 14, 2017 at 13:38

L3viathan

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3 Comments

julesbou Over a year ago

thanks, problem is I can have characters after the url, see regex101.com/r/lMCWPP/1

L3viathan Over a year ago

Then change the $ into a character set of values definitely not in the URL: regex101.com/r/lMCWPP/2

julesbou Over a year ago

Thanks, what if I don't want to match the space after the end of the url?

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