Additional path names are now detected.
However, the patterns have also been anchored more tightly, meaning they
are more accurate, so they will match less slop (this may affect certain
edge cases where people unknowingly depended on false-positives, e.g.,
`parasite.yml').
Technical details about regexp changes:
* Remove unnecessary `.*' at beginning
* Anchor file names with leading `/' to prevent partial matches
- (eg., don't match `not-main.yml')
* Restructure capture groups so that `\\.yml' extension is at very end
* Support `.yaml' extensions as well
* Anchor the very end with `$'
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