Processing rule pattern doesn't seem to respect lookahead
I have a processing rule with a pattern that matches email addresses. I only want to hash the username part of the address since I need to retain the domain part, so I encapsulated the part of the regex including and after the @ to be a zero-width positive lookahead i.e. /username(?=@domain)/. Unfortunately, this results in the entire email address getting hashed instead of just the username. Do the processing rules not support this for performance reasons or is this just an oversight?
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