How To Capture This Pattern With Regex In Javascript?

How to capture the following pattern using JavaScript regular expressions? I would like to capture the first sequence of characters ending at a word boundary. The sequence length s

Solution 1:

If I well understood try something like

var n   = 6, 
    str = "aa bb cc ddd ee",
    re  = newRegExp("^.{"+ (n+1) +"}.*?\\b");

str.match(re);  // "aa bb cc"

Solution 2:

This regex should work

"^.{" + (n+1) + ",}?\b"