Filter duplicate values in string Javascript-CodePudding

When mentioning users, if I mention one user more than once, I get string like:

"@[Firstname Lastname](4652) @[Firstname Lastname](4652) @[Firstname Lastname](4652)"

I tried to filter so the payload contains only one of those values. (@[Firstname Lastname](4652)) The first problem I occured is the space is optional, so I couldn't split the array (I created an array out of string) by space. If I split it with @, it doesn't send the @ in the payload. I assume I should create some kind of regex which will compare text between '@' and last ')', based on uses's ID which is in the brackets. But I was unable to create one. Another issue is that users can write text as well, not just mention users, so it could look like:

"bla bla @[Firstname Lastname](4652) bla bla @[Firstname Lastname](4652) bla bla"

CodePudding user response：

You can first split the entire string using split(" ")

const string = "bla bla @[Firstname Lastname](4652) bla bla @[Firstname 
Lastname](4652) bla bla";

const stringArr = string.split(" "); //Split the string into array of strings

let users = [];
const userPattern = /@[a-z]*)/i; //Begins with `@` and ends with `)`    

stringArr.forEach((item) => {
   if(userPattern.test(item)
   {
      users.append(item);
   }
});

users = unique(users);

Function to remove duplicates

function unique(a) {
    var seen = {};
    var out = [];
    var len = a.length;
    var j = 0;
    for(var i = 0; i < len; i  ) {
         var item = a[i];
         if(seen[item] !== 1) {
               seen[item] = 1;
               out[j  ] = item; //Adding unique arrays to this array
         }
    }
    return out;
}

Hope this helps