regular expression for matching substring with wildcard

Bo
2011 11 29
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更新时间：2015 2 28
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Hi,
I would like to find the number of substrings in a string. The substring contains a unimportant character. For example:
string a = 'AFAFABBB' substring: 'AXA' (X represent an unimportant character)
If I use:
regexp(a,'A.A')
in matlab, it returns:
ans = 1
But the correct answer (for my case) should be 1 and 3. How to make that right?
Thanks!
Bo

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