If you’ve programmed in Perl or any other language with built-in regular-expression capabilities, then you probably know how much easier regular expressions make text processing and pattern ...

This is the most basic kind of regular expression, where each character is matched literally. This is, of course, just a taste of what regular expressions can do.

A more general solution is to use RegEx (regular expressions) to define a pattern that meets your desired requirements. Regular expressions are as complicated as they are powerful.