Testing expressions

echo "Jan  7 18:02:23 firewall sSMTP[13962]: Sent mail for logcheck@firewall.example.com (221 firewall.example.com closing connection) uid=102 username=logcheck outbytes=780"| egrep -i --color "^\w{3} [ :0-9]{11} firewall sSMTP\[[0-9]+\]: Sent mail for logcheck@firewall.example.com .*$"

regular expressions rexp -

Most people use perl compatable regexpressions (pcregex) - be aware there are differences Also see visual-regexp package.
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