repeated characters in string

Question

Ebtesam Almansor 2016-10-13

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https://ww2.mathworks.cn/matlabcentral/answers/307041-repeated-characters-in-string

回答： Gautam Mohan 2016-10-18

Hi there, I want to delete any character which repeated more than 3 in string I have this code which delete all repatriation Input = {'CEEEGH';'CCEEG';'ABCDEFF';'BCFGG';'BCDEEG';'BEFFH';'AACEGH'}

cellfun(@unique,Input,'UniformOutput',0)

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James Tursa 2016-10-13

Delete characters that repeat more than 3 times total, or more than 3 times in a row?

Jos (10584) 2016-10-13

What is the output supposed to look like?

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Answer 1

Gautam Mohan 2016-10-18

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Hi Ebtesam,

If you want to delete any character which is repeated three or more times in a row, you can substitute the @unique function in your cellfun() with a regexp that searches for 3+ character matches and replaces them with nothing:

f = @(s) regexprep(s, '(\S)\1\1+', '');
cellfun(f,Input,'UniformOutput',0)

If you need to eliminate characters that occur 3 or more times throughout the whole string, I would recommend writing a separate function that accomplishes that goal and then applying it to each string using cellfun().

Hope this helps!