in reply to reserved characters

As well as the documentation referenced above, I have found a tool called My REGEX Tester very good for checking out and experimenting with REGEX.
I have a link to it in Found new online Regex tool.
Plus there is a nice website called Regular-Expressions Quickstart. This teaches all of the basics of REGEX.

REGEX can be very useful, and easy to use if you just study up on some of the basics.

-- Grey Fox
"We are grey. We stand between the darkness and the light" B5