No. 

<leftop: key_value /[,;]/ key_value>

[download]

is equivalent to 

( key_value (/[,;]/ key_value)(s?) { [ $item[1], @{$item[2]} ] } )

[download]

The "(s?)" is already built in.

In reply to Re^2: Parse::RecDescent Grammar Questions by ikegami
in thread Parse::RecDescent Grammar Questions by gmarler

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