Python-based regular expression parser that allows patterns to call functions?

[Paul McGuire]

pyparsing also includes a decorator function, traceParseAction, which
will list out calls to parse actions, the tokens passed in, and the
value returned or exception raised.  If you add "@traceParseAction"
before each of the parse actions in my example, you can see the token
processing being done in the parse actions.

-- Paul