what is a regular expression?

[pelegk1]

what is a regular expression?
when do u use it?

[fredmv]

Originally posted by pelegk1
what is a regular expression?A regular expression is merely a pattern in which represents a string. For more information, see: http://etext.lib.virginia.edu/helpsheets/regex.html.Originally posted by pelegk1
when do u use it? It's generally used to either validate form data (e.g., phone numbers, e-mail addresses, etc.) or to make smart replacements, among other things.

[chouchou]

Or have a look at these:

www.regular-expression.info
www.johnrobertmorris.com/dev/Regex.asp

chouchou