List of all regex implementations?

Question

Is there a list of Regex implementations on the web, showing their differences / similarities?

For exaple, Emacs elisp Regex is different to JavaScript or Perl regex

Answer 1

I found this overview very useful when i get confused with the different variants.

Answer 2

http://www.regular-expressions.info is the closest thing I know to a comprehensive list (and even it is nowhere near complete). (This page in particular.)

Answer 3

There is a list of libraries, languages and applications supporting regular expressions on Wikipedia which includes a feature comparison table:

http://en.wikipedia.org/wiki/Comparison_of_regular_expression_engines

Answer 4

Take a look at the Regular Expression Flavor Comparison on Regular-Expressions.info. It contains at least the nowadays most important regular expression implementations and their characteristics.