d=`date +%Y-%m-%d_%H-%M-%S`
recipients="something@gmail.com"
subject="Alert"
from="something@something.com"
message_txt="Nothing Found is catched at $d"


declare file="alert.txt"
declare regex="\s+ Cannot \s+"
declare regex2="\s+ Nothing Found \s+"

declare file_content=$( cat "${file}" )


wget -O - url/alert.php | grep "Cannot\|Nothing found" > alert.txt


if [[ " $file_content " =~ $regex2 ]] # please note the space before and after the file content
    then
       /usr/sbin/sendmail "$recipients" << EOF
       subject:$subject
       from:$from
       $message_txt

EOF
    fi
exit