[Pyparsing] matching a previous match

[Waylan L. <wa...@gm...>]

I'm trying to match an string enclosed in backticks. Rather than using
an escape character, the string is simply wrapped in more backticks.
Here are some examples:

`foo` => foo
``foo`bar``  => foo`bar
`` `bar` `` => `bar`     #note the spaces in this one

This is easy in regex:

(?P<backtick>`+)(?P<string>.*?)(?P=backtick)

Of course, the trick is that the ending string of backticks must
exactly match the opening string of backticks.

Sure I can use Regex() for this, but I'm trying to figure you how to
do that without regex. How can I refer back to a previous match?

-- 
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Waylan Limberg
wa...@gm...