How to determine if a string contains a sequence of repeated letters

Question

Using JavaScript, I need to check if a given string contains a sequence of repeated letters, like this:

\"aaaaa\"

How can I do t

Answer 1

This will check if the string has repeats more than twice:

function checkStr(str) {
    str = str.replace(/\s+/g,"_");
    return /(\S)(\1{2,})/g.test(str);
}