This check used to just show the regular expression that failed to match,
but the rules are pretty subtle and hard to interpret from the regular
expression alone.
Add some basic checks for the main things that go wrong:
- Missing capitalisation.
- Missing full-stop.
- Missing path.
- Single-word subject.
This work was funded through GitHub Sponsors.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>
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