I was just passed this and it’s SWEET! I have to share. First, do you know what RegEx and Pattern Matching is? No? Here’s some information for you:

• RegEx (Another great site there) – A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is .*.txt$.
• Pattern Matching – In computer science, pattern matching is the act of checking for the presence of the constituents of a given pattern. In contrast to pattern recognition, the pattern is rigidly specified. Such a pattern concerns conventionally either sequences or tree structures. Pattern matching is used to test whether things have a desired structure, to find relevant structure, to retrieve the aligning parts, and to substitute the matching part with something else.

Otherwise, get right to the meat. The site is: http://www.gskinner.com/RegExr/

Welcome to RegExr 0.3b, an intuitive tool for learning, writing, and testing Regular Expressions. Key features include:

* real time results: shows results as you type
* code hinting: roll over your expression to see info on specific elements
* detailed results: roll over a match to see details & view group info below
* built in regex guide: double click entries to insert them into your expression
* online & desktop: regexr.com or download the desktop version for Mac, Windows, or Linux
* save your expressions: My Saved expressions are saved locally
* share and rate expressions: search Community expressions and share your own

Built by gskinner.com with Flex 3 [adobe.com/go/flex] and Spelling Plus Library for text highlighting [gskinner.com/products/spl].

Bravo to the author!! Bravo to you sir!