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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);

Coloring the same elements in a string [closed]

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I work with JavaScript on my bachelor thesis.
I would like to read a string and mark the elements that are the same and follow each other in the same color.
I have not found a good approach yet.
I would be grateful for a good proposal.
This is what i have right now.
function colorsetting(input){
var collength = input.length;
var now = '', last2 = '', colored = '';
now = last2 = input[0];
for(var i = 1; i <= collength, i++){
if(now !== last2){
colored = last2.fontcolor("green");
last2 = now;
}
now = input[i];
}
colored = last2.fontcolor("red");
return colored;
}

You can split up your input string using a regex:
/(.)\1*/g
(.) grabs any character, and stores that in capture group 1.
\1* then tells the regex to match as many of those as it can.
Then, iterate over that array, wrap the strings in a span, each with their own colour.
const str = "aaaabbbb123aaaaccccz";
const result = str.match(/(.)\1*/g);
console.log(result);
result.forEach(t => {
// Create a span element
const span = document.createElement("span");
// Set the text in that span to be the current match
span.innerText = t;
// Set the span's color to something random.
span.style.color = "#"+((1<<24)*Math.random()|0).toString(16);
document.body.append(span);
})
(random color code from here)

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]

Variable reset to default option, WHY? [closed]

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I do not understand how I keep ending up with "null" after variable is assigned a number.
function evalKayScript(syn){
coms = extract(syn,"{...}");
document.write(JSON.stringify(coms));//debug
for(x in coms){
ops = extract(coms[x],"(...)");
com = null; //<-- ***com preset null***
for(y in funNames){
if(ops[1] == funNames[y]){
com = y; //<-- ***com changed to "y"***
}
}
alert(com); <-- alerts given below (first two alerts)
if(com == null){
alert("Command ((("+ops[1]+"))) Not Registered!");
return null;
}
exe = funValues[y];
inputs = execVars(ops[2]);
inputs = extract(inputs,"[...]");
for(y in inputs){
exe.replace(new RegExp("/\(\%"+y+"\%\)/gim"),inputs[y]);
}
exe.replace(new RegExp("/\(\%name\%\)/gim"),ops[0]).replace(new RegExp("/\(\%function\%\)/gim"),ops[1]);
exea = exe;
if(exe.replace(new RegExp("/\:\:\:javascript/gim"),"")! = exes){ //<-- new invalid ":" error
eval(exe);
}else{
evalKayScript(exe);
}
}
}
I do not understand why, variable "com" goes to a number, then back to null...
I have setup some error catching in my own form, and i end up with these alerts:
0 //<-- var com
null //<-- ***var com? this makes no sense, how does it go back to null?***
Command ((("(%name%) already exists!"))) Not Registered! //<--caused by if(com == null) This is normal.
Live script at http://jstone88.bugs3.com/kayscript/file1.html, and JS file at http://jstone88.bugs3.com/kayscript/kayscript.js

You aren't using RegExp constructor as it should have been used.
It is like this:
new RegExp("pattern without / at the beginning an end","flags");
/pattern/flags is literal form of writing a regex in js, but it is different in RegExp constructor.

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("");