A regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or

A regular expression (abbreviated regex or regexp) is a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings, or string matching, i.e. "find and replace"-like operations.
Attribution to: Alex Tennant
This content is remixed from stackoverflow or stackexchange. Please visit https://salesforce.stackexchange.com/questions/31248