[Solved] The following MATLAB code is intended to replace all digits in str with '#' but does not work as expected: str = 'Room 101';... What is the error and how to fix it? | MATLAB

MATLAB - String Handling

The following MATLAB code is intended to replace all digits in str with '#' but does not work as expected:

str = 'Room 101';
newStr = regexprep(str, '\d', '#');
disp(newStr);

What is the error and how to fix it?

APattern should be '\\d+' to replace all digits at once

BNo error; code works correctly

CPattern should be '\\D' to match digits

DUse regexp instead of regexprep

Step-by-Step Solution

Solution:

Step 1: Analyze the regexprep usage
The pattern '\\d' matches any single digit, and regexprep replaces all occurrences by default.
Step 2: Check the output
Replacing each digit with '#' in 'Room 101' results in 'Room ###', which is expected.
Final Answer:
No error; code works correctly -> Option B
Quick Check:
regexprep replaces all matches by default [OK]

Quick Trick: regexprep replaces all matches even with single-digit pattern [OK]

Common Mistakes:

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