Can the subsequences overlap?

If not, what should 

aaaaaaaaaaa*aa*aaaaaaaaaaaaaaa*aa*aaaaaaaaaaa

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return? The following all match some interpretation of your spec: 
aaaaaaaaaaa*aa*aaaaaaaa     2
aaaaaaa*aa*aaaaaaaaaaa      2

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or 
aaaaaaaaaaa*aa*aaaaaaaaaa   2
aaaaa*aa*aaaaaaaaaaa        2

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or 
aaaaaaaaaa                  0
a*aa*aaaaaaaaaaaaaaa*aa*a   4
aaaaaaaaaa                  0

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or 
aaaaaaaaaaa                 0
*aa*aaaaaaaaaaaaaaa*aa*     4
aaaaaaaaaaa                 0

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In reply to Re: How to parse string to substrings based on character occurence in the string by ikegami
in thread How to parse string to substrings based on character occurence in the string by ihperlbeg

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