well, aside from abigail's golfing, i think i should point out that, while it may not be causing your syntax error, this piece of code:

s/(.)(.)(.)(.)/$a+=2**($_-1)if$$_/ee for 1..4
[download]

represents a logical error. what are you performing the s/// on? $_. you explicitly set $_ above, but you are resetting it in the for loop. so this won't work; it will try to match each of 1..4 against /..../ and fail every time because none of them is 4 digits long.

i believe your syntax error, though, is in the fact that you are using && after the inline for loop. or maybe there should only be one /e. or maybe i'm barking up the wrong tree; but there's something to work on. i find, when golfing, that it helps to write the algorithm out long-way and shorten it a bit at a time (or a byte at a time) as i go.

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