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...mgrep is not a grep replacement, but it is intended to be grep-compatible: implemented options and behavior should be the same as those of grep.
mgrep is written in C++ using the Boost.Regex library.
A configure/make system is provided for Linux, but its source code should compile on all platforms that have the std and Boost.Regex libraries installed.
cfgrep is an attempt to produce a grep-like program that uses regular expressions extended to describe context-free grammars. The largest part of the project is the C++ library developed to process those expressions.