Postal codes are not properly handled by regex in JavaScript

'^[AaBbCcEeGgHhJjKkLlMmNnPpRrSsTtVvXxYy]{1}\d{1}[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]{1}[ -]*\d{1}[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]{1}\d{1}$'

When trying to validate inputs like T3K2H3 or T3K-2H3 from a .net form using the regular expression above, it does not work correctly in JavaScript.

var rxPostalCode = new RegExp('^[AaBbCcEeGgHhJjKkLlMmNnPpRrSsTtVvXxYy]{1}\d{1}[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]{1}[ -]*\d{1}[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]{1}\d{1}$');

var postalCode = 't3k2h3';

var matchesPostalCode = rxPostalCode.exec(postalCode);

if (matchesPostalCode == null || postalCode != matchesPostalCode[0]) {

    $scope.AccountInfoForm.PostalCode.$setValidity("pattern", false);

    $scope.showLoading = false;

    return false;
}
javascriptregexangularjs

Answer №1

In the realm of javascript, it is imperative to utilize // instead of ''

in this manner:

/^[AaBbCcEeGgHhJjKkLlMmNnPpRrSsTtVvXxYy]{1}\d{1}[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]{1}[ -]*\d{1}[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]{1}\d{1}$/

For further reference, I recommend checking out the following link:

Validating email addresses in JavaScript

Answer №2

There are two ways to define a regular expression object:

var rxPostalCode = /^[abceghj-np-tvxy]\d[abceghj-np-tv-z][ -]?\d[abceghj-np-tv-z]\d$/i;

or 

var rxPostalCode = new RegExp('^[abceghj-np-tvxy]\\d[abceghj-np-tv-z][ -]?\\d[abceghj-np-tv-z]\\d$', 'i');

Keep in mind that when using the second method, you will need to double backslashes.

Answer №3

https://www.w3schools.com/js/js_regexp.asp

"Always remember to properly escape the backslash \ when using RegExp("pattern") as it is an escape character in strings."

var rxEmail = new RegExp('^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$');

I have tested this in Firefox's console and it works perfectly.

Answer №4

Consider using the pattern below:

^[AaBbCcEeGgHhJjKkLlMmNnPpRrSsTtVvXxYy]\d
[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz][ -]*\d
[AaBbCcEeFfGgHhJjKkLlMmNnPpRrSsTtVvWwXxYyZz]\d

Try removing the $ at the end to see if it resolves the issue you are facing.

I have simplified the code by replacing \d{1} with \d.

You may also consider changing [ -]* to [ -]? if you do not want to allow multiple spaces or dashes.

It appears that JavaScript may not be storing the VAR properly due to the $ expecting the end of the line or string. Try removing the $ or keeping it and trimming the string to see if it helps.

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