Use the replace menu by pressing Ctrl+H, and make sure regular expressions are enabled. Then,
Find (^.*\/).* and Replace $1:
https://regex101.com/r/lJ4lF9/12
Alternatively, Find (?m)(^.*\/).* and Replace $1: https://regex101.com/r/lJ4lF9/13
Explanation:
Within a capture group, Find the start of the string (^) followed by anything any number of times (.*) until the last “https://stackoverflow.com/”, then anything any number of times. Replace with the captured group by referencing it as $1.
(?m)
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solved Clean Urls with regular expression