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replace the string from just before the last dot(.) [closed]

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I have a string like A/B/C/D.txt
So I want to replace the character just before the last . with the new one.
Like I would add E in last So the output should be A/B/C/E.txt
Can this is possible with only replace and concat Or Regex should help?

I'm sure the output is correct.
A/B/C/E.txt
var filename = 'A/B/C/D.txt';
var dotIndex = filename.lastIndexOf('.');
document.write(filename.substr(0, dotIndex-1) + 'E'+filename.substr(dotIndex, filename.length-dotIndex));

var parts = 'A/B/C/D.txt'.split('.');
if(parts.length > 1)
{
parts[parts.length-2] = parts[parts.length-2].replace(/.$/,"E");
let result = parts.join('.');
console.log(result);
}

Try this:
let name = "A/B/C/D.txt"
let res = name.substr(0, name.lastIndexOf(".")) + "E." + name.substr(name.lastIndexOf(".") + 1);
console.log(res);

Javascript script return errors [closed]

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Following code is returning error. Since I am beginner so i need to help so that i can fix the error
<script>
function myFunction() { var message, x; message = document.getElementById("message"); message.innerHTML = ""; x = document.getElementById("demo").value; try { if(x == "") throw "empty"; if(isNaN(x)) throw "not a number"; x = Number(x); if(x < 5) throw "too low"; if(x > 10) throw "too high"; } catch(err) { message.innerHTML = "Input is " + err; } }
</script>

In the first example you're assigning the HTML element defined by the id "message" to the message variable, and then setting the innerHTML of that element to an empty string. It's a useful caching method if you need to, for example, change more than the innerHTML, like the style, or attribute values too.
In the second example you're doing more or less the same thing but, in this case, there is no reason for you to assign it to a variable. You can simply set the innerHTML of the HTML itself:
document.getElementById("message").innerHTML = "";

var message = document.getElementById("message");
message.innerHTML = "";
In message you have an element, you can use message to manipulate it how many time you want.
var message = document.getElementById("message").innerHTML();
In that you are putting in message the string inside the inner Html

In this case
var message = document.getElementById("message");
message.innerHTML = "";
message is of typeElement (here the MDN documentation: getElementById) and then you set its property innerHTML as ""
but here
var message = document.getElementById("message").innerHTML = "";
you create a variable named message and set it as the returning value of the operation document.getElementById("message").innerHTML = "" that, in this case, is ""
Conclusion:
The first code will result in having the variable message as an Element object;
The last code will result in having the variable message as, in this case, an empty string

How to validate postcode in a form using JavaScript [closed]

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I'm trying to validate a postcode using JavaScript.
I have my regex.
^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))) {0,1}[0-9][A-Za-z]{2})$
This is my function so far, not sure how to implement regex.
function validatePostcode()
{
var postcode = document.getElementById("postcode").value;
}
Any other suggestions that would format a postcode that matches;
CF24 9DG

You can do something like this:
function validatePostalCode(){
var regExp = /^([Gg][Ii][Rr] 0[Aa]{2})|((([A-Za-z][0-9]{1,2})|(([A-Za-z][A-Ha-hJ-Yj-y][0-9]{1,2})|(([A-Za-z][0-9][A-Za-z])|([A-Za-z][A-Ha-hJ-Yj-y][0-9]?[A-Za-z])))) {0,1}[0-9][A-Za-z]{2})$/;
var postcode = document.getElementById("postcode").value;
if( regExp.test( postcode ) ){
// Do something here, result is true.
} else {
alert("result is false");
}
}
You can try it out in this fiddle: http://jsfiddle.net/Cedriking/5b8wtf1f/2/

You should use JavaScript test() Method RegExpObject.test(string) that returns:
TRUE if the input string matches the RegExpObject regex
FALSE if the input string does not match the RegExpObject regex
Your validator function should look like this:
var validatePostCode = function(postCode) {
var parsePostCode = 'your_regex';
return parsePostCode.test(postCode);
};
var postCode = document.getElementById("postcode").value;
validatePostCode(postCode); // calling the validator function

I can't replace this pattern in javascript [closed]

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I need your help on my new project
I hate regular expressions and its rules but i must use it this project.
want do this replace
var aString = '[bkz:sample key]';
I want get into key variable 'sample key' value from this aString
var key,clean;
key = 'sample key';
clean = cleanChars(key);
// clean = sample_key
//my target
key
how can i do this?
thanks in advance

function extractKey(str) {
var match = (str || '').match(/^\[bkz:(.+)\]$/);
return match? match[1] : '';
}
extractKey('[bkz:sample key]'); //sample key

var aString = "[bkz:sample key]";
var regex = /^\[(.+)\:(.+)\]$/;
var matches = regex.exec(aString);
// "sample key" should now be in matches[2]

Jquery/Javascript Issue [closed]

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I'm new to query/javascript and having a problem with the following code to calculate a gross value and tax amount based
on the net amount the user enters. The user will enter a double amount and the gross and vat amounts are also defined as doubles.
Can anyone help? I get an error: "Uncaught SyntaxError: Unexpected number" when i try running the following code.
$('#netPayment').change(calcLowerVatRateAndGrossAmount);
/* $('#netPayment').change(function(){
calcLowerVatRateAndGrossAmount();
}); */
});
function calcVatRateAndGrossAmount(){
var netPayment = parseFloat($('#netPayment').val());
var vatAmount = 00.0;
var VatRate = 20.0;
var grossPayment = 0.00;
var totalPaymentAmount = 0.00;
if (netPayment !== '') {
vatAmount = (netPayment * VatRate) / 100;
grossPayment = (netPayment - vatAmount);
$('#vatAmount').val(parseFloat(vatAmount.data).toFixed(2));
$('#grossPayment').val(parseFloat(grossPayment.data).toFixed(2));
} else {
$('#vatAmount').val(vatAmount.amountNull);
$('#grossPayment').val(grossPayment.amountNull);
}
};

So you calculate a number here
vatAmount = (netPayment * VatRate) / 100;
And in here, you treat vatAmount as an object that has a key data
$('#vatAmount').val(parseFloat(vatAmount.data).toFixed(2));
You should just be using the variable. A simple test
console.log("variable itself: ", vatAmount);
console.log("key data: ", vatAmount.data);
So you would need to just do
$('#vatAmount').val(vatAmount.toFixed(2));
$('#grossPayment').val(grossPayment.toFixed(2));
You do the same thing with grossPayment and you reference some other property vatAmount.amountNull
$('#vatAmount').val(vatAmount.amountNull);
$('#grossPayment').val(grossPayment.amountNull);
should be
$('#vatAmount').val(""); //or any error message
$('#grossPayment').val("");