UniversalCodeGrep (ucg) is an extremely fast grep-like tool specialized for
searching large bodies of source code. It is intended to be largely
command-line compatible with Ack, to some extent with ag, and where appropriate
with grep. Search patterns are specified as PCRE regexes.

ucg is intended to address the impatient programmer's code searching needs. ucg
is written in C++11 and takes advantage of the concurrency (and other) support
of the language to increase scanning speed while reducing reliance on
third-party libraries and increasing portability. Regex scanning is provided by
the PCRE library, with its JIT compilation feature providing a huge performance
gain on most platforms.

As a consequence of its use of these facilities and its overall design for
maximum concurrency and speed, ucg is extremely fast; up to 30x faster than Ack
in some cases.