jrep is a command-line grep-like utility written in Java. Features: -- Java regular expressions (https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html) -- Support for RE2J (https://github.com/google/re2) -- POSIX options (excluding -E and -G) (http://pubs.opengroup.org/onlinepubs/009604499/utilities/grep.html) -- most GNU grep(1) options (https://www.gnu.org/software/grep/) -- Extensions over GNU grep(1): options -O, -2 and -8