You have a cell array of strings: {'abc123', 'def456', 'ghi789'}. How do you extract only the numeric parts from each string using MATLAB regular expressions?

hard📝 Application Q15 of 15

MATLAB - String Handling

You have a cell array of strings: {'abc123', 'def456', 'ghi789'}. How do you extract only the numeric parts from each string using MATLAB regular expressions?

AUse <code>regexp(cellArray, '\\d+', 'match')</code>

BUse <code>regexp(cellArray, '\\w+', 'match')</code>

CUse <code>regexprep(cellArray, '\\D', '')</code>

DUse <code>regexprep(cellArray, '\\d+', '')</code>

Step-by-Step Solution

Solution:

Step 1: Understand the goal
We want to keep only digits, removing all non-digit characters.
Step 2: Choose the correct function and pattern
regexprep replaces patterns. Using \\D matches non-digits, so replacing them with empty string keeps only digits.
Final Answer:
Use regexprep(cellArray, '\\D', '') -> Option C
Quick Check:
Remove non-digits with \D pattern [OK]

Quick Trick: Replace non-digits (\D) with empty string to keep digits [OK]

Common Mistakes:

Using regexp with 'match' returns cell arrays, not strings
Replacing digits instead of non-digits
Using \w+ which matches letters and digits

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More MATLAB Quizzes

You have a cell array of strings: {'abc123', 'def456', 'ghi789'}. How do you extract only the numeric parts from each string using MATLAB regular expressions?

Step 1: Understand the goal

Step 2: Choose the correct function and pattern

Final Answer:

Quick Check:

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