I'm a little late to the party, but JREPL.BAT is a hybrid JScript/batch script based regex utility that runs natively on any Windows machine from XP onward.
Full documentation is built into the script, which can be accessed via
JREPL /?, or use
JREPL /?? for paged output.
JREPL uses standard ECMA regex that comes with JScript. ECMA regex is not quite as powerful as the .NET regex available to powershell, but it is still pretty darn good. And I think the average user will find this utility easier to use than powershell.
The built-in JREPL options already provide a lot of inherent power, but the ability to inject user supplied JScript really opens up amazing possibilities.
I developed the script because my workplace does not allow downloading of non-standard exe files, but has no restriction on writing batch or JScript scripts :-)
Simply follow the link and copy the script code into a file named JREPL.BAT. Read the subsequent posts from that thread for examples of usage and development history. There are also many StackOverflow answers that use JREPL.BAT.