mgrep is a command line tool that allows users to search text files for lines matching a given regular expression. It is similar to the well-known Unix utility, grep.
As a natural extension to the single-line regular expressions, mgrep is also capable of searching for multiline patterns.
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...
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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.