Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.

Parboiled is a Java and Scala library providing for lightweight and easy-to-use, yet powerful and elegant parsing of arbitrary input text based on Parsing expression grammars (PEGs). PEGs are an alternative to context free grammars (CFGs) for formally specifying syntax, they make a good replacement for regular expressions and generally have quite a few advantages over the “traditional” way of building parsers via CFGs.