Question

I’m trying to solve a (simple) programming problem in Javascript and I can’t figure out how to get it working. I have a program which starts by reading in a text string using prompt.

The program outputs either “Valid name” or “Invalid name”, depending on whether the input names fit the required format, which is:

“last name, first name, middle initial”

where neither of the names can have more than 15 characters.

I know there’s an easy way to do this, but I can’t seem to find it anywhere. Thanks for your help!

Answer 1

I wouldn’t use \w, as it includes characters such as _ and the nine digits. Consider the regular expression in the following test:

<script>
    if ("Nami, Guilherme, P".match(/^[A-Z][a-z]{1,14}, [A-Z][a-z]{1,14}, [A-Z]\.?$/)) {
        alert("Valid");
    }
    else {
        alert("Invalid");
    }
</script>