▶ cat urls.txt 
https://example.com/path?one=1&two=2
https://example.com/path?two=2&one=1
https://example.com/pathtwo?two=2&one=1
https://example.net/a/path?two=2&one=1

▶ cat urls.txt | qsreplace newval
https://example.com/path?one=newval&two=newval
https://example.com/pathtwo?one=newval&two=newval
https://example.net/a/path?one=newval&two=newval

▶ cat urls.txt | qsreplace -a newval
https://example.com/path?one=1newval&two=2newval
https://example.com/pathtwo?one=1newval&two=2newval
https://example.net/a/path?one=1newval&two=2newval