How to use backrefs with stateful lexer?

[ssquirrel]

I would like to parse blocks starting and ending with the same string, eg.

\start XXX
    ...
\end XXX

The XXX should match. And I do want to capture XXX once. It's the name of the block.

[alecthomas]

Use \1 in a pushed state to refer to the capture groups from the rule that did the push. There's an example in the tests.

[alecthomas]

This is not the right use case for the stateful lexer though. I would just capture the identifiers in the parser, and verify that that match later during an analysis pass.

[ssquirrel]

Thanks a lot!