Perhaps what is needed to start with is to ask people to send output
examples of different kinds of grep. We could put these example in a
new file etc/grep.txt similarly to etc/compilation.txt.
That is a good idea. Please start that file.
I've collected a few examples in the file attached below. The section
`grep ???' contains examples deduced from regexps in `grep-regexp-alist'.
Could someone recognize what grep produces them?
The first three seem to follow the GNU spec for column numbers
and ranges. I don't know whether GNU grep can output these,
but in principle it could do so.
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