My code does not work - im trying to see if the first letter is a capital :: JavaScript

Im trying to see if the first letter of a string is a Capital.

Here is my HTML

Test:<br/>
<input type="text" name="Testr" size="25" />

And here is my JavaScript

var namer=document.logOn.Testr.value;

if(/[^A]/.test(namer)){             
     alert("CHOMP CHOMP");
  开发者_如何学Python      return false;
}

I dont understand why my code doesnt work?

What do you guys think?

Your regular expression looks for anything that's not capital "A". Try:

if (/^[A-Z]/.test(namer)) {
  // starts with a capital letter
}
else {
  // starts with something else
}

What I changed was:

• The "^" needed to be outside the "[]" to indicate that you're checking the start of the value
• The range needed to cover all the upper-case letters, not just "A"

Note that if you're interested in matching upper-case characters from elsewhere in the Unicode space, you'll have to include those explicitly.

Try using this regex instead:

/^[A-Z]{1}/

Your regular expression is incorrect. You're checking that namer doesn't begin with the capital letter A. You need to use a range instead:

if(/^[A-Z]/.test(namer)){             
     alert("CHOMP CHOMP");
        return false;
}

see the answer from this question: How to make it so a string has to start with a capital letter with JavaScript?

you're only testing the capital letter A...

Try

if(/^[A-Z]/.test(namer)){             
     alert("CHOMP CHOMP");
        return false;
}

Something like this:

<input type="text" id="Testr" size="25" />

...

var namer = document.getElementById('Testr').value;

if(/^[A-Z]/.test(namer)){
    alert("CHOMP CHOMP");
    return false;
}