R1:155cb1d2c5a8

Fix two issues with repository monogram regular expressions

Summary: Ref T4245. Fixes T10172. These regular expressions were simply incorrect: they intend `<start> (form one | form two) <end>` but were written as `(<start> form one) | (form two <end>)` which allowed stuff like "R2/R13" to be interpreted as a monogram because it matches `(<start> form one)`.

Test Plan: Parsed commit `ba46ffa6169c` from RTEMS repository, see T10172. Before patch, got an identical trace; after patch, clean import.