regular expression for matching substring with wildcard

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Bo 2011-11-29

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编辑： Walter Roberson 2015-2-28

采纳的回答： Walter Roberson

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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Walter Roberson 2011-11-29

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https://ww2.mathworks.cn/matlabcentral/answers/22514-regular-expression-for-matching-substring-with-wildcard#answer_29694

编辑：Walter Roberson 2015-2-28

在 MATLAB Online 中打开

regexp(a,'A(?=.A)')

See http://www.mathworks.com/help/matlab/matlab_prog/lookahead-assertions-in-regular-expressions.html

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