I have attached a new parsers.py file which contains pygments lexers for ANTLR and Ragel parser generators.
I have tested this on a large number of example files (http://ananelson.com/tmp/). If you would like to add examples for this to your test directory let me know what license you require them to be and I will look for something suitable.
I have not changed the copyright notice on whichever lexer file I copied as a template.
I'm sure there are a few edge cases that will need tweaking, so you might want to put my contact info in this file for people to get in touch with me directly if you decide to add it to pygments.