Looking for regex to extract email addresses from /etc/passwd

Posted by Brent on Stack Overflow See other posts from Stack Overflow or by Brent
Published on 2008-09-18T18:26:26Z Indexed on 2010/03/19 4:31 UTC
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linux

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regex

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sed

Most of my users have email addresses associated with their profile in /etc/passwd. They are always in the 5th field, which I can grab, but they appear at different places within a comma-separated list in the 5th field.

Can somebody give me a regex to grab just the email address (delimeted by commas) from a line in this file? (I will be using grep and sed from a bash script)

Sample lines from file:

user1:x:1147:5005:User One,Department,,,[email protected]:/home/directory:/bin/bash
user2:x:1148:5002:User Two,Department2,[email protected],:/home/directory:/bin/bash

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