regex - How do I replace the spaces between words in Emacs? -

i have files consisting of words:

ndkjsank ndjksandknsakj                                      dnsjakndjskndjknsakjn dsajkndksnakjndsnajkndjkas  dsnjak    

and replace (sometimes multiple) spaces between them single tab:

dsnak**\t**ndsjka njdkas**\t**ndksjankda njdsaibdusai**\t**nkdsnakjdnas 

is possible using regular expression in emacs? thought might away using rectangular selection area words of varying length (and file far long manually).

edit:

this comes close selects spaces/newlines/tabs right of second word:

\s- 

the regexp want  +. call m-x replace-regex replace  + \t. note there's empty space before + sign.

also, produce tab might have hit c-qc-i keys. i'm not sure if accepts \t syntax when called interactively.