javascript - Replace nth word in sentence -


i have function string, i'm looking way format 3rd word (which number, want format comma). idea how it? should that:

function formatnumber(txt){     return txt.replace(3rd-word, formatnumber(3rd-word)); }

match word consists of digits, , format it:

txt = txt.replace(/\b(\d+)\b/g, format);

using formatting function, example:

function format(s) {   var r = '';   while (s.length > 3) {     r = ',' + s.substr(s.length - 3) + r;     s = s.substr(0, s.length - 3);   }   return s + r; }

demo: http://jsfiddle.net/guffa/5ya62/


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