replace_multiple_spaces_ith_single.html

<!DOCTYPE html>
<html>
    <head>
        <title>Replace multiple spaces with a single space in Javascript</title>
    </head>
<body>
</body>
<script>
    let str="Demo                         string";
    str = str.replace(/\s\s+/g, ' ');
    // Result : 'Demo string'
    // \s stands for “whitespace character”. \s\s - two times because we have to check spaces are two times or greater.
    // The plus sign + is a greedy quantifier, which means one or more times
</script>
</html>    