[Zelphyr]

One of the best and most powerful alternatives to RegEx I've ever seen is the PARSE function used in the Rebol and Red programming languages.

    page: read http://hq.rebol.net
    parse page [thru <title> copy title to </title>]
    print title
    The REBOL Developer Network

[eggy]

I like the compactness and syntax of Red a lot.

Pharo's Petit Parser is a framework for building parsers that is also pretty nifty [1].

[1] https://github.com/moosetechnology/PetitParser