Partial retrieve

Shell Programming and Scripting
1

I have this in log file /var/log/maillog

XXX YYY ZZZ [55.66.77.88]:15214 I=[11.22.33.44]:25 AAA BBB CCC

I need awk/sed operation on this, so that it retrieves only the first IP.

cat /var/log/maillog | sed_operation
55.66.77.88
2 
awk -F"[][]" '{print $2}' /var/log/maillog
55.66.77.88
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3 
perl -lne 'print $1 if /(\d+\.\d+\.\d+\.\d+)/' /var/log/maillog
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