bless_test_result: Change case matching to regex search

[jgfouca]

This makes it quite a bit more user-friendly since the frequent use case of just providing a substring is now just substring instead of .*substring.*.

Checklist

• My code follows the style guidelines of this project (black formatting)
• I have performed a self-review of my own code
• My changes generate no new warnings
• I have added tests that exercise my feature/fix and existing tests continue to pass
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding additions and changes to the documentation