6627 reading dcm folder filtering filenames

[wyli]

Fixes #6627

Description

adding a fname_regex option to the pydicom reader

Types of changes

• Non-breaking change (fix or new feature that would not break existing functionality).
• Breaking change (fix or new feature that would cause existing functionality to change).
• New tests added to cover the changes.
• Integration tests passed locally by running ./runtests.sh -f -u --net --coverage.
• Quick tests passed locally by running ./runtests.sh --quick --unittests --disttests.
• In-line docstrings updated.
• Documentation updated, tested make html command in the docs/ folder.

[ericspod]

Should we test specifically for passing a different pattern, or a pattern which matches nothing?

[ericspod]

Looks good here. We've encountered the issue here of exceptions being raised when trying to read a non-DICOM file such as the LICENSE file. The approach I've used in the past with pydicom is to try to read everything and skip over any file raising InvalidDicomError, this has unintented consequences of course. What we can do instead is use is_dicom from the library to check any file first if this doesn't have too much of a performance penalty.

[wyli]

Looks good here. We've encountered the issue here of exceptions being raised when trying to read a non-DICOM file such as the LICENSE file. The approach I've used in the past with pydicom is to try to read everything and skip over any file raising InvalidDicomError, this has unintented consequences of course. What we can do instead is use is_dicom from the library to check any file first if this doesn't have too much of a performance penalty.

thanks! I'm adding some exception handling for InvalidDicomError, and user can set fname_regex=None to use the is_dicom checker.

[wyli]

/build