So I needed this regex to filter any non-decimal entry in Query String parameter. I've created an expression like this: \D+|^$.
I ran the following tests:
1234567 (no matches, cool)
d (1 match, cool)
da (1 match, cool)
123124d124124 (no matches, not cool)
Am I missing something? My version is 8.2.0.
Thanks in advance.