There's no look-behind functionality of the type you want.

But what's wrong with: 

BLOCK: '{' statements '}'

StatementBlock: BLOCK /(\s*;)*/ { $item[1] }

[download]
???

In reply to Re: Parse::RecDescent--pretending there's a semicolon after a BLOCK by TheDamian
in thread Parse::RecDescent--pretending there's a semicolon after a BLOCK by BrentDax

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