regular expressions please help me

[I.Delic]

hi,

Can somebody help me with checking the format of the mail adress.
"@" character should be included in the mail adress.
For example:

User should type an valid mail adress.
name@domainname.com

thank you in advance

idriz

[RAC_1]

grep address

You something like this.
cat "address" | tr -d "@"
stat=$(echo $?)

if [ ${stat} -ne 0 ];then
echo "not a valid address"
exit 1
else
echo "Valiad from address"
exit 0
fi

Anil

[Fred Ruffet · Accepted solution]

with perl :

#echo test | perl -e 'while () { chomp; ~ m/^.*@.*$/g; print "Not a valid address!\n" if (!pos); }'
Not a valid address!
#echo test@domain.com | perl -e 'while () { chomp; ~ m/^.*@.*$/g; print "Not a valid address!\n" if (!pos); }'
#

Regards,

Fred

[A. Clay Stephenson]

Something like this should work:

ADDRESS="cstephen@xyz.com"
echo "${ADDRESS}" | grep -E -q '^[a-zA-Z]+@[a-zA-Z0-9]$'
STAT=${?}
if [[ ${STAT} -eq 0 ]]
then
echo "Pattern ok"
else
echo "Pattern bad"
fi

The -q put grep -E in quiet mode. We are only interested in the status. Change ${ADDRESSS} to a value without the @ and it should fail with ${STAT} being set to a non-zero value.

A more rigorous test would probably use awk to split the address into an array using the @ and then do an nslookup for an MX record.