Add invalid character test for is_possible_3wa
#19
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is_possible_3wa
currently excludes invalid characters, but this is an incomplete list and many invalid characters can still be accepted as a "possible" w3w address.This PR adds a failing test for this case, but does not fix the issue as the regex is very hard to understand and I think it's better that someone familiar with the original intent attempts to fix it properly.
This is also a problem with
find_possible_3wa
anddid_you_mean
.