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How to replace new line with white space in text documents

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Fateme Jalali
Fateme Jalali 2016-1-31
评论： Andrew Mohan 2018-1-17
Hello,I am trying to change all new lines in my database with white space,but codes does not work.can any one help me please.Data base is attached.
test1 = fileread('part1.txt');
newTest = sprintf(strrep(test1, '\n', ' '))

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Stephen23
Stephen23 2016-1-31
编辑：Stephen23 2016-1-31
str = regexprep(test1,'\s+',' ');
or
str = regexprep(test1,'[\n\r]+',' ')

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