Sorry, my bad, really. Nuc, we can't expect everyone to be a *IX sysadmin here, even developers could have spent years without getting in touch with regexes.
Anyway, it is nice to use these guys, that is sort of a regular expression.
In Linux/UNIX, if you have a text that talks about Joe and you want to replace all this with Jimm in the story, then you do something like this:
cat story.txt | sed s/Joe/Jimm/g
s --> a command for substituting
g --> global, means --> replace entirely in the text, do not replace merely the first match.
That could be called "sed language"
Indeed, sed and a bunch of other really-handful UNIX/Linux tools are available purely for Windows (not via cygwin):
http://unxutils.sourceforge.net/
Try those, they could be damn useful even in Windows :)
hint:
sed, gawk, grep, wget, less ... and ALL OTHER are good ones to explore :)
And like this one could explore the beauty of the Linux/UNIX command-line world before migrating to it :)
