Shell Programming and Scripting

echo CONTACT PEOPLE:first_name1.last_name1,first_name2.last_name2,first_name3.last_name3 | cut -d: -f2

^contact people:(?:[^\.]*?\.[^\.]*)+

#!/bin/sh
cat ./test.txt|{
awk '/^CONTACT PEOPLE:(?:[^\.]*?\.[^\.]*)+/ {flag1++}
 END {
                if(flag1==1)
               {
                print"----------------------------------"|"cat>&2"               
               }
                else  
                {
               print"XXXXXXXXXXXXXXXXXXXXXXXXXX"|"cat>&2"                  
                }
        }'
}

$ 
$ cat test.txt
CONTACT PEOPLE:first_name1.last_name1,first_name2.last_name2,first_name3.last_name3
$ 
$ awk '/^CONTACT PEOPLE:(?:[^\.]*?\.[^\.]*)+/' test.txt
$ 
$

$ 
$ awk '/^CONTACT PEOPLE:([^\.]*?\.[^\.]*)+/' test.txt
CONTACT PEOPLE:first_name1.last_name1,first_name2.last_name2,first_name3.last_name3
$