Wrong match length?

Hi,
I ran into an issue in the following scenario:
`pattern = re_compile("{\\w+}");`
`match_pos = re_matchp(pattern, "{{FW}_TEST", &match_length);`

The result is that match_pos==1 (correct), but match_length==5 (incorrect).
I was expecting to get match_pos==0 and match_length==5 --OR-- match_pos=1 and match_length==4.
Tnx
Yair

Start by reproducing the reported example with re_compile and re_matchp, checking both match_pos and match_length for the pattern and input shown. Compare the result with the two expected outcomes in the report and document which matching semantics should apply before adding a regression check.

Written by the indexing model from the issue text.