JREPL.BAT is described as 'powerful, general purpose, command line, regular expression text processor for ASCII data. It is a hybrid JScript/batch script that should run on any Windows machine from XP onward'. There are four alternatives to JREPL.BAT for Linux, Mac, Windows, BSD and Haiku. The best alternative is grep, which is both free and Open Source. Other great apps like JREPL.BAT are ripgrep (Free, Open Source), The Silver Searcher (Free, Open Source) and ack (Free, Open Source).
Ack is designed as a standalone (one perl file) replacement for 99% of the uses of grep. ack is intelligent about the files it searches. It knows about certain file types, based on both the extension on the file and, in some cases, the contents of the file.