I use Regex101.com and its great. The only issue is that I test patterns here and then they don't behave the same way in QF. It usual has to do with the way new lines are handled.
Here is my example.
Looks great here but when I test in QF it still captures that random f above the line I actually want. I tried adding a \r,\n,\S and I can't get it to not capture that f so if there is a site that will behave more like how QF behaves. Thanks.