The /e flag does not work on a regex. Instead, it's a flag that says the right hand side of a s///, which is a string, needs to be treated as code. The regex is the left hand side in s/// (or the whole thing in //).

Surely you must have been thinking of (?{CODE}) and friends? (See perlre)

In reply to Re^2: A (non) reg-ex question by bart
in thread A (non) reg-ex question by Ido

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