Help to construct a loop

Hi  
I will to build a loop (for-each or while, etc)
  I have a long string saved in a variable myString:
    myString= foo ffd : ppp ttt foo : 3mmm foo

  In this sample there are three substrings separated
by a colon token
  How could it be done, looking over the myString in a
loop and f. i.
 save the substring in a variable named buf1  until
all three substrings
 has been read  ?
  I will be very glad for any hint
  Regards
  Henry


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