if [  -s $regfiles_name ]; then
                grep "ALL MACHING RECORD COLUMNS MATCHED (Baseline and Regression File)" $regfiles_name
                retval=$?
                if [ $retval != 0 ]; then
                   echo $regfiles " - There is a mismatch" >> reg_email_body
                else
                   echo $regfiles " - Matched" >> reg_email_body
                fi
fi

#!/bin/sh
#set -x

filename="your_file"

lineA="ALL MATCHING RECORD COLUMNS MATCHED (Baseline and Regression File)"
lineB="Total Mismatched Records (Baseline File): 0"
lineC="Total Mismatched Records (Regression File): 0"


if grep "$lineA" "$filename" && grep "$lineB" "$filename" && grep "$lineC" "$filename"
then
echo "Match"  >> reg_email_body
else
echo  "There is a mismatch"  >> reg_email_body
fi