greg2

what is this?

greg2 is Yet Another grep. This one uses Go RE2 and attempts to behave similarly to GNU grep where equivalent functionality is supported.

why another grep?

I needed to implement a moving-window algorithm for something else and it was easier to test it in a smaller app first. Also a good mental exercise!

options

Usage of ./greg2:
  -after int
    	lines of following context to print for each match
  -before int
    	lines of preceding context to print for each match
  -filenames string
    	show filenames in output (valid options: no, auto, yes) (default "auto")
  -ignorecase
    	perform case-insensitive matching
  -match string
    	RE2 regular expression to match against the input files
  -quiet
    	do not output any matches

ideas

context selection by regular expression

To do this, implement -before-from-re and -after-to-re, which is something I've always wished grep had. It can also be done with sed:

sed -n '/BEFOREMATCH/,/AFTERMATCH/p' inputfile

parallel searching of files

This is Go, after all.

license

Copyright 2018 John Slee. Released under the terms of the MIT license as included in this repository.