bug#41766: Make it possible to change regexp to identify and highlight grep matches via customization

[Lars Ingebrigtsen]

Simon Lang <Simon.lang@outlook.com> writes:

> Attached pls find the revised patch.

Thanks.  It looks like everybody agreed that this was a good change, but
then nobody applied your patch, so I did that now (to Emacs 28).

There was then some followup discussion about possible tweaks, and those
can now be done, and I'm closing this bug report.

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