I'd say all extracted lines which pass a syntax check with perl -c without error are per definition perl code.
Really? 
$foo=1

[download]
What language is that? It could be perl, but it could also be PHP, and I expect a few other things. What language it is may perhaps be divined from the surrounding lines of code - it's certainly more likely to be perl if the lines before and after also match your rule.

In reply to Re^2: Recognizing Perl in text by DrHyde
in thread Recognizing Perl in text by Anonymous Monk

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