Can't figure this one out

I am trying to make a program that takes user input of a name and turns their input into regular names, hyphenated names, nicknames, prefixes, and suffixes. All of it has gone well so far, except for nicknames. I tell the user to put their nicknames in quotes (single or double) and I will be able to print what they typed in the quotes. Example:

Input: Dwayne 'The Rock' Johnson Output: Regular Names: Dwayne, Johnson; Nicknames: 'The Rock'

I have made a loop to iterate through all the characters in the input and try and find nicknames, here it is:

 // get nicknames

    for (let a = 0; a < char.length; a ++) {

      if (char[a] == "'" || char[a] == '"') {

        joinarr.push(char[a]);

        for (let b = a + 1; true; b ++) {

          if (char[b] == char[a]) {

            joinarr.push(char[b]);
            break;
          }
          joinarr.push(char[b]);
        }
      }
    }

Notice that the loop with 'a' as a counter loops through all the characters. In the loop, it tests If char[a] is a single or double quote. If it is, it adds that quote to the joinarr array. It then enters a loop with a true condition that uses 'b' as a counter, with a value of a + 1. It then tests if char[b] is equal to char[a]. If it is, that would mean that char[b] is the end quote for that nickname, so it adds the end quote to the array and breaks the loop, otherwise it just adds char[b] to the array. My problem is that when I run this, my program crashes, telling me that the true loop never stops which is strange because I always type the corresponding end quote. Been at this a couple days, anyone any ideas?