Replace multiple lines using regular expression

9 次查看（过去 30 天）
Ravi Rahul Kumar Shah
回答： Sameer 2024-2-14
How do I replace multiple lines using regular Expression?
strTxt = 'Hello! This is just a text and in new line inputParameter';
inputParameter = magic(5);
strTxt = regexprep(strTxt, 'inputParameter', inputParameter); % it is showing error

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回答（1 个）

Sameer
Sameer 2024-2-14
Hi Ravi,
From my understanding, you've encountered an issue when trying to replace a substring in a string using regular expressions. Additionally, you're seeking information on how to replace multiple lines.
The error in your code is occurring because ‘regexprep’ expects the replacement string to be a character array (or string), but ‘inputParameter’ is a matrix since it's generated by the magic(5) function. MATLAB cannot directly convert a numeric matrix into a string format suitable for inclusion in a text string without explicit formatting.
If you want to include a string representation of the ‘inputParameter’ matrix in ‘strTxt’, you need to convert it to a string first. You can use "mat2str" to convert the matrix into a string representation, and then pass that to ‘regexprep’.
www.mathworks.com/help/releases/R2021a/matlab/ref/mat2str.html
Below is the corrected code:
strTxt = 'Hello! This is just a text and in new line inputParameter';
inputParameter = magic(5);
% Convert the matrix to a string representation
inputParameterStr = mat2str(inputParameter);
% Replace 'inputParameter' in the text with its string representation
strTxt = regexprep(strTxt, 'inputParameter', inputParameterStr)
For a multi-line scenario, you can use similar code, as ‘regexprep’ will work regardless of whether the string is single or multi-line. The regular expression 'inputParameter' will match the placeholder text whether it is on the same line or across multiple lines.
Below is an example code:
%Multi-line text
strTxt = sprintf('Hello! This is just a text\nand in new line inputParameter\nwith some more text following it.');
inputParameter = magic(5);
inputParameterStr = mat2str(inputParameter, 5);
strTxt = regexprep(strTxt, 'inputParameter', inputParameterStr)
Hope this helps!
Sameer

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