It looks like a simple grammar so I'd use a recursive descent parser, Parse::RecDescent for one.

This is just a example off the top of my head and completely untested.

start   : '(' section(s) ')'
section : '(' id entry(s) ')'
entry   : '(' section | keypair ')'
keypair : '(' key value ')'

[download]

Update

Looking at this again, entry shouldn't have those terminal brackets -- it would only parse sections like '(id ((key value))', so just

entry : section | keypair

[download]

(I did say this was just off the top of my head !)

In reply to Re: Parsing a file with parentheses to build a hash by RichardK
in thread Parsing a file with parentheses to build a hash by xcellsior

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