Replace URL string

I’m trying to replace a URL string in the posts that have ended up in there. It usually starts with /index.php?l= and it has a bunch of variable text in there making up a phrase, usually word-word-word. Is there a way to remove that type of string?

I’ve tried http:\/\/example\.com[^>]*. Thanks for any help.

https://wordpress.org/plugins/search-and-replace/