parboiled is a mixed Java/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. parboiled is released under the Apache License 2.0.

Citrus is a compact and powerful parsing library for Ruby that combines the elegance and expressiveness of the language with the simplicity and power of parsing expressions.