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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)

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

JavaScript: Unexpected token [closed]

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Closed 8 years ago.
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Introduce the problem before you post any code:
I have a simple JavaScript code and it's giving me an unexpected token error. It's code that I'm trying to convert from PHP to JavaScript for use in a Phonegap application.
Specifically it is the line that declares the $ex_data variable. And it says the unexpected token is the section between the $system and $galaxy variables.
Code
for ($galaxy = 1; $galaxy < 21; $galaxy++){
for ($system = 1; $system < 601; $system++){
var $ex_data = '{"planet_id":-1,"sid":'.$system.',"language":"en","gid":'.$galaxy.'}';
var $url = "http://54.193.106.113/ING004/android1/WebServer/Web/sogame/newControl/nmUniverse/getUniverse?sign=".toUpperCase($sign);
}
}
CLEAR QUESTION:
How do I fix the line so that it is valid?

You are confusing PHP concatenation with JavaScript (C) concatenation.
for ($galaxy = 1; $galaxy < 21; $galaxy++) {
for ($system = 1; $system < 601; $system++) {
var $ex_data = '{"planet_id":-1,"sid":'
. $system . ',"language":"en","gid":' . $galaxy.'}';
var $url = "http://54.193.106.113/ING004/android1/WebServer/Web/sogame/newControl/nmUniverse/getUniverse?sign="
.toUpperCase($sign);
}
}
Change the ".s" to "+s".
var $ex_data = '{"planet_id":-1,"sid":'
+ $system + ',"language":"en","gid":' + $galaxy + '}';
or alternatively
var $ex_data = JSON.stringify({
"planet_id" : -1,
"sid" : $system,
"language" :"en",
"gid" : $galaxy
});
Also, as pointed out below, change .toUpperCase($sign); -> + $sign.toUpperCase();

var $ex_data = '{"planet_id":-1,"sid":' + $system + ',"language":"en","gid":' + $galaxy +'}';
var $url = "http://54.193.106.113/ING004/android1/WebServer/Web/sogame/newControl/nmUniverse/getUniverse?sign=" + $sign.toUpperCase();

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]