Variable formatting check in bash script - regex

Question

I have a real simple script to update a table based on a flat file but am concerend as the list keeps getting longer and longer a non valid formatted variable will get introduced and cause issues.
#!/bin/bash
OLDIFS=$IFS
IFS=,
file1=file.csv
while read mac loc; do
dbaccess modemdb <<EndOfUpdate 2>/dev/null
UPDATE profile
SET localization= '$loc'
WHERE mac_address = '$mac';
EndOfUpdate
done <"$file1"
IFS=$OLDIFS
The file contents are as such.
12:BF:20:1B:D3:22,RED-1234
12:BF:20:2D:FF:1B,BLUE-1234
12:BF:20:ED:74:0D,RED-9901
12:BF:20:02:69:7C,GREEN-4321
12:BF:20:02:6B:42,BROWN
12:BF:20:ED:74:0D,BLACK
What I am having difficulty with is how can I set a format check of the $mac and $loc variables so if they don't match it stops running. the $loc can be any 19 digits so just need to make sure its not null and not longer. The mac address needs to be not null and in the format as in the file. I found reference in another post to this check but not sure how to integrate.
`[[ "$MAC_ADDRESS" =~ "^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$" ]]`
Looking for help on how to create the validations.
Thanks,

Answer 1

Check MAC address with regex:
#!/bin/bash
file1=file.csv
while IFS="," read mac loc; do
if [[ "$mac" =~ ^([0-9a-fA-F]{2}:){5}[0-9a-fA-F]{2}$ ]]; then
dbaccess modemdb <<EndOfUpdate 2>/dev/null
UPDATE profile
SET localization= '$loc'
WHERE mac_address = '$mac';
EndOfUpdate
else
echo "Error: $mac"
fi
done <"$file1"
Your regex is for bash only a string if you use quotation marks.