"This article describes some applications that support regular
expressions and some simple ways of usage. A few interesting
extensions for different types of applications are mentioned. Just
thinking about them can give a good approximation where one might
find them and possibly use them.
"All programmers encounter regular expressions sooner or later.
Making logical operations is common in every programming language
and differs mainly in syntax. They were the first reason for making
these functions common in many different types of applications. I
wouldn't know anything about it, though..."