CODEWITHSUNDEEP
regexvalidationpostal-code
DanielAttard
DanielAttard

Reputation: 3615

Validate postal cade using Regex on each character

I am trying to validate a Postal Code for Canada using Regular Expressions, but I would like to test each character as it is entered rather than wait until the user submits the form.

All of the examples I have found so far (including this one), seem to only validate the entire user entry rather than each character as it is entered.

This is what I am using so far, but it only works for the entire user entry, not on each character:

function validate(myform) {
if (myform.zip.value == "" || myform.zip.value == null || myform.zip.value == "Postal Code" || myform.zip.value.length > 7 ) {
    alert("Please fill in field Postal Code. You should only enter 7 characters");
    myform.zip.focus();
    return false;
}
return okNumber(myform);
}

function okNumber(myform) {
var regex = /^[ABCEGHJKLMNPRSTVXY]\d[A-Z] *\d[A-Z]\d$/;
if (regex.test(myform.zip.value) == false) {
    alert("Input Valid Postal Code");
    myform.zip.focus();
    return false;
}
return true;
}

Does anyone have any examples of how to validate a Postal Code as each character is entered?

Upvotes: 0

Views: 230

Answers (1)

MRAB
MRAB

Reputation: 20664

You could write the regex as a series of alternatives which match a partial Postal Code of one character, of two characters, etc, up to the complete Postal Code, but I'm not sure whether a regex is the right way to validate a Postal Code anyway.

Upvotes: 0

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