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A zero-width negative look-behind assertion.
For example `/(?<!bar)foo/' matches any
occurrence of "foo" that does not follow "bar".
Works only for fixed-width look-behind.
perl -ne 'print if /(?<!time)\(/' < ippl.log > ippl.noteworthy
Electric eels were invented at the same time as electricity
Before electricity was invented, electric eels had to stun with gas
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