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How to Remove two consecutive double quotes from array after split [closed]

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I have a requirement where i will get the input from the user. He can enter
"features1,feature2",feature3,"feature4"
something like this. I'm using this
let arr: any = message.split(/,(?=(?:(?:[^"]*"){2})*[^"]*$)/)
to split the string and i'm getting result like
[""feature1,feature2"","feature3",""feature4""]
but i want the result like this
["feature1,feature2","feature3","feature4"]

I don't thing what you're trying to achieve is possible only using split function.
After you split, loop over the error and replace " with `` (empty).
const message = `"features1,feature2",feature3,"feature4"`;
let arr = message.split(/,(?=(?:(?:[^"]*"){2})*[^"]*$)/);
arr = arr.map(el=>el.replace(/"/g,''));
console.log(arr);

Email Regex for Javascript Which not start with Number [closed]

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^[a-zA-Z]\w+#[a-zA-Z_]+?\.[a-zA-Z]{2,4}$
i had tried this regex for email but it allow following cases
123#mail.com
example.mail#mail.com

Here is the code which searches for the number at the start.
If number is matched it prints message in console.
let regex = /^[0-9]/;
let object = [{email:'123#mail.com'},{email:'example.mail#mail.com'}];
for(let i =0;i<object.length;i++){
if(object[i].email.match(regex)){
console.log('E-mail ',object[i].email,' is not valid.')
}
}
This is the used regex: ^[0-9]

String to integer conversion using javascript [closed]

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I have a two textbox and i want to convert string value such as "apple" and "cat" into appropriate integer value using javascript.

Simple...
var myInt = "cat";
var converted = parseInt(myInt, 10);
console.log(converted);
>>NaN

Regular express to match `command--o1--o2--o3` [closed]

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I have a string like command--o1--o2--o3 ( command,o1,o2,o3 are arbitrary words)
And I want get [o1, o2, o3] though a Regular Expression(Not a array operation or other ways. JUST only use Regular Expression).
Is there any idea to accomplish this !?

If you're using JavaScript, and assuming you want all strings after a --, you may do
var things = str.split(/--/).slice(1)
If you just want to get the 2 characters words following --, then you may use
var things = str.match(/--\w\w/g).map(function(s){ return s.slice(2) })

Regex String URL [closed]

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Example
1. http://ad.ly/123411/http://blabalba.com/adaf
2. http://ad.ly/142145/http://blabal.com/adf34
how to replace front String http://ad.ly/1246721/ use js regex
into http://blabalbal.com/adaf
get this http://blabalbal.com/adaf

The regexp required is http:\/\/adf_.ly\/\d+\/(.+)
var str = 'http://adf_.ly/1246721/http://prefiles.com/files';
var re = /http:\/\/adf_.ly\/\d+\/(.+)/;
var newstr = re.exec(str)[1];

You can just take the part you're interested in using lookahead directive:
s = 'http://adf_.ly/123411/http://blabalba.com/adaf';
u = s.match(/(?!^)http:\/\/.+?$/)[0];
//=> http://blabalba.com/adaf