filter_yaml name parameter is a regex, is that behavior confusing?

Background

When filter_yaml was implemented it was decided that all of the fields would be regexes, although this wasn't clearly documented. When https://github.com/windmilleng/tilt.build/pull/469 was merged there was a discussion about whether this behavior is confusing or not. For example, it might be surprising to a user that this filter call:

filter_yaml(rest, name='baz')

Would match names like "foobaz", "bazaar" or "foobazbar".

Question

Should we change the default behavior to not be regexes?

Should we make it more clear that these fields are regexes? (For example: we could rename the parameter name from name to name_regex

Something else?

Start with internal/tiltfile/tiltfile_state.go at lines 1191-1197 and inspect how filter_yaml handles its fields. Review the linked tilt.build discussion and the examples in the issue, then define the expected matching behavior or naming/documentation change. Done means the selected behavior is implemented or clearly documented and covered by appropriate tests.