This tutorial teaches you how to create your own regular expressions, starting with the most basic regex concepts and ending with the most advanced and specialized capabilities.| www.regular-expressions.info
The Perl programming language, originally designed for text-processing only, is the main cause for the popularity that regular expressions enjoy nowadays. Mainly because Perl’s regex engine introduced many new powerful features, and because regexes are part of the Perl syntax, and not an add-on library as with most other languages.| www.regular-expressions.info
In a regular expression, the caret matches the concept “start of string”, while the dollar sign matches “end of string”| www.regular-expressions.info