c# - regex not giving all the possible matches -

I have to get all the possible matches for the word in the regular expression given in C # and C #. But the Regex.Matches () function is not giving it up. For example

  Regex.Matches ("datamatics", "[^ aeiou] a [^ aeou]")   
 returns only two matches  
  dat mat   
 This is not giving "Tam" as a match. Can someone explain to me why he is not giving "Tam" as a match and how can I get these three?   
 
 
 You can not get overlapping matches in Reggae You have several ways of working around it, though . You can either use  Regex.Match , and specify a preliminary index (use a loop to go through your entire string), or you can see, Or look like this:  
  (? = [^ Aeou] a) [^ aeou]   
 This works because see and look-eyed characters Do not consume it, it gives a  mail  in which the match is indexed, because you have to use it instead of capture, because Only one letter has been captured.