I am attempting to write a filter that matches the regex ^[a-zA-Z0-9_.+-]+@(?:(?:[a-zA-Z0-9-]+\.)?[a-zA-Z]+\.)?(example)\.com$. (I want to capture every email that is from a specific domain). However, it keeps returning the error Invalid preceding regular expression. The expression works correctly so I am unsure why this error is occuring. This is the first time I've written a sieve filter so am I missing something?
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RHPT
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Try `^[a-zA-Z0-9_.+-]+@(([a-zA-Z0-9-]+\.)?[a-zA-Z]+\.)?(example)\.com$` – Wiktor Stribiżew Apr 15 '20 at 22:09
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@WiktorStribiżewThat worked! Thank you. What was the issue with my original expression? – RHPT Apr 16 '20 at 13:08
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You may use
^[a-zA-Z0-9_.+-]+@(([a-zA-Z0-9-]+\.)?[a-zA-Z]+\.)?(example)\.com$
It appeas that the regex should comply with the POSIX ERE regex syntax that does not allow non-capturing groups.
So the solution was to replace all (?: with ( in this regex.
Wiktor Stribiżew
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