Emit a correct invalid-name message when using multi-naming style. (#4924)
* Emit a correct invalid-name message when using multi-naming style.
Previously, given `--function-rgx=(?:(?P<UP>[A-Z]+)|(?P<down>[a-z]+))$` and the code:
```
def FOO():
pass
def UPPER():
pass
def lower():
pass
```
It would emit a message: ``Function name `lower` doesn't conform to '(?:(?P<UP>[A-Z]+)|(?P<down>[a-z]+))$' pattern [invalid-name]``.
The message is misleading as `lower` *does* conform to `(?:(?P<UP>[A-Z]+)|(?P<down>[a-z]+))$`. It's just not the prevalent group "UP".
After this commit, the message becomes: ``Function name `lower` doesn't conform to UP group in the '(?:(?P<UP>[A-Z]+)|(?P<down>[a-z]+))$' pattern [invalid-name]``
Co-authored-by: Pierre Sassoulas <[email protected]>7 files changed
