Canadian Postal Code Validation - Python - Regex

Below is the code I have written for a Canadian postal code validation script. It's supposed to read in a file: 123 4th Street, Toronto, Ontario, M1A 1A1 12456 Pine Way, Montreal,

Solution 1:

I do not guarantee that I fully understand the format, but this seems to work:

\b(?!.{0,7}[DFIOQU])[A-VXY]\d[A-Z][^-\w\d]\d[A-Z]\d\b

Demo

You can also fix yours (at least for the example) with this change:

(?!.*[DFIOQU])[A-VXY][0-9][A-Z].?[0-9][A-Z][0-9]

(except that it accepts a hyphen, which is forbidden)

Demo

But in this case, an explicit pattern may be best:

\b[ABCEGHJ-NPRSTVXY]\d[ABCEGHJ-NPRSTV-Z]\s\d[ABCEGHJ-NPRSTV-Z]\d\b

Which completes is 1/4 the steps of the others.

Demo

Solution 2:

This generic code can help you

import re
PIN = input("Enter your Address")
PIN1= PIN.upper()
if (len(re.findall(r'[A-Z]{1}[0-9]{1}[A-Z]{1}\s*[0-9]{1}[A-Z]{1}[0-9]{1}',PIN1)))==1:
print("valid")
    else:
        print("invalid")

As we are taking input from user. So there is many chances that user can type postal code without space, in lower case letters. so this code can help you out with 1) Improper spacing 2)Lower case letter