Regular expression to validate credit card number
Last Updated on Thursday, 12 August 2010 10:38 Thursday, 12 August 2010 10:32
Credit card numbers contain four groups of numbers where each group contains 4 numbers. The following regular expression ( regexp ) will accept all credit card number in this format: - 1234 5678 1234 5678 - 1234567812345678 - 1234-5678-1234-5678
#!/bin/bash
# regexp to get a valid credit card number
echo $1 | grep -qE '^([0-9]{4}[- ]?){3}[0-9]{4}$'
if [ $? -eq 0 ]; then
echo "$1 is a valid credit card number."
else
echo "$1 is an invalid credit card number."
fi
Execution:
$ chmod +x validate_credit_card_number.sh $ ./validate_credit_card_number.sh "1234 5678 1234 5678" 1234 5678 1234 5678 is a valid credit card number. $ ./validate_credit_card_number.sh 1234567812345678 1234567812345678 is a valid credit card number. $ ./validate_credit_card_number.sh 1234-5678-1234-5678 1234-5678-1234-5678 is a valid credit card number. $ ./validate_credit_card_number.sh 1234-5678-1234-56786 1234-5678-1234-56786 is an invalid credit card number. $ ./validate_credit_card_number.sh 1234-55678-1234-5678 1234-55678-1234-5678 is an invalid credit card number.
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