[Solved] What is wrong with this MATLAB code? str = 'test123'; idx = regexp(str, '\\d'); disp(idx{1}); — Ans: regexp returns numeric array, so {} indexing causes error | MATLAB

MATLAB - String Handling

What is wrong with this MATLAB code?

str = 'test123';
idx = regexp(str, '\\d');
disp(idx{1});

Aregexp returns numeric array, so {} indexing causes error

BPattern '\\d' is invalid

Cdisp cannot display numeric arrays

DMissing 'match' option in regexp

Step-by-Step Solution

Solution:

Step 1: Understand regexp output without 'match'
Without 'match', regexp returns numeric array of start indices.
Step 2: Check indexing on numeric array
Using {} on numeric array causes an error; () should be used instead.
Final Answer:
regexp returns numeric array, so {} indexing causes error -> Option A
Quick Check:
Use () for numeric arrays, {} for cell arrays [OK]

Quick Trick: Use () for numeric arrays, {} for cell arrays [OK]

Common Mistakes:

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