[antlr-interest] Antlr grammar for regular expressions

[Andy Tripp]

sr?an bejakovic' wrote:
> Hi all,
>
> does anyone know of an Antlr grammar for parsing (perl or java) 
> regular expressions? I started implementing something like this, but I 
> don't want to (suboptimally) reinvent something that probably already 
> exists. Thanks,
>
> Srdan
Sun's JDK1.7 is under the GPL, and there's a regex parser in the 
java.util.regex.Pattern class.
Just download the source for JDK1.7 and look at 
src/share/classes/java/util/regex/Pattern.java
The recursive decent parser code starts at method a method called 
expr(), and the code actually
looks pretty readable.