MATLAB: How to replace a word in a string with ****

strings

Hello I have a text file where I am supposed to compare the strings in the text file with the words in another text file. After finding the word that I want to replace, how do I replace it? The first thing I did was use strfind to find the word. After that I have to replace the word with **?

 str = 'Long day';
 word = 'Long';
 t = strfind(str, word);

After doing this I get 1. Now how do I change 'Long day' to '**** day'? The word can be of any length, so you may need more ********.

Thank you

Best Answer

Try

    str = strrep( str, 'Long', '****' );

and read strrep, Find and replace substring

Related Solutions

MATLAB: How to check if string contains some special character

For #1 you could use isstrprop().

For #2, see startsWith(str, '_') and endsWith(str, '_')

For #3, you can use find():

indexes = strfind(str, '__');

For #4 you could do something like

if str(1) >= '0' && str(1) <= '9'
    % str starts with a numerical digit.
else
    % str does not start with a numerical digit.
end

MATLAB: Replacing only certain instances of text within matlab character array

Method One: split the string

>> str = '___6002__6002___6002___6002__';
>> idx = regexp(str,'6002','once','end');
>> strcat(str(1:idx),strrep(str(idx+1:end),'6002','0'))
ans =
___6002__0___0___0__

Method Two: use a placeholder

>> str = '___6002__6002___6002___6002__';
>> str = regexprep(str,'6002','\b','once');
>> str = strrep(str,'6002','0');
>> regexprep(str,'\b','6002')
ans =
___6002__0___0___0__

Note that the original string must not contain \b.

Method Three: dynamic regular expression

>> str = '___6002__6002___6002___6002__';
>> regexprep(str,'(.*?6002)(.*)','$1${strrep($2,''6002'',''0'')}')
ans =
___6002__0___0___0__

Best Answer

Related Solutions

MATLAB: How to check if string contains some special character

MATLAB: Replacing only certain instances of text within matlab character array

Related Question