I guess the original regexp was created to match different grep output
formats. From this regexp I can deduce such formats that use space or
tab as a separator between file name, line number and source line.
I can't tell is it right to drop support for those formats.
I think that if we wrote a separate regexp for each kind of grep, all
together they would match a lot fewer different strings than the
current regexp does, and they would be much easier to understand.
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