Regular Expression to validate US postal codes
Last Updated on Thursday, 12 August 2010 10:31 Thursday, 12 August 2010 10:00
Simple way to validate US postal codes using regular expression and optionally bash. US postall codes accept five digit ZIP number + optional 4 digit code. For example 32344-4444 and 32344 are valid codes but 323445-44 and 323445 are invalid.
#!/bin/bash
# regexp to get a valid US postal code
echo $1 | grep -qE '^[0-9]{5}(-[0-9]{4})?$'
if [ $? -eq 0 ]; then
echo "$1 is a valid US postal code."
else
echo "$1 is an invalid US postal code."
fi
Execution:
$ chmod +x validate_us_postal_code.sh $ ./validate_us_postal_code.sh 32344-4444 32344-4444 is a valid US postal code. $ ./validate_us_postal_code.sh 32344 32344 is a valid US postal code. $ ./validate_us_postal_code.sh 323445-44 323445-44 is an invalid US postal code. $ ./validate_us_postal_code.sh 323445 323445 is an invalid US postal code.
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