Match substrings fuzzily

[carreter]

Description

Fixes #2043.

To Do

• [ ] Documentation. (If you've added a new command-line flag, for example, find the appropriate page under docs/ to describe it.)
• [ ] Changelog. (Add an entry to docs/changelog.rst to the bottom of one of the lists near the top of the document.)
• [ ] Tests. (Very much encouraged but not strictly required.)