String replacement in MATLAB - Cheat Sheet & Quick Revision

Recall & Review

beginner

What function in MATLAB is commonly used to replace parts of a string?

The strrep function is used to replace occurrences of a substring within a string with another substring.

beginner

How does strrep work in MATLAB?

It takes three inputs: the original string, the substring to find, and the substring to replace it with. It returns a new string with all occurrences replaced.

beginner

Example: What is the result of strrep('hello world', 'world', 'MATLAB')?

The output is 'hello MATLAB' because the substring 'world' is replaced by 'MATLAB'.

intermediate

Can strrep replace multiple occurrences of a substring in MATLAB?

Yes, strrep replaces all occurrences of the specified substring in the original string.

beginner

What happens if the substring to replace is not found in the original string when using strrep?

The original string is returned unchanged because there is nothing to replace.

Which MATLAB function replaces all occurrences of a substring within a string?

A stringreplace

B strrep

C substitute

D replaceall

The correct function is strrep. The others do not exist in MATLAB.

What does strrep('apple pie', 'pie', 'cake') return?

A 'apple cake'

B 'apple pie'

C 'cake pie'

D 'applecake'

It replaces 'pie' with 'cake', so the result is 'apple cake'.

If the substring to replace is not found, what does strrep do?

A Returns the original string unchanged

B Returns an error

C Returns an empty string

D Replaces the whole string

strrep returns the original string unchanged if the substring is not found.

Can strrep replace multiple occurrences of a substring?

A No, it replaces only the last occurrence

B No, it replaces only the first occurrence

C It depends on an additional parameter

D Yes, it replaces all occurrences

strrep replaces all occurrences of the substring in the string.

What is the correct syntax for strrep?

A strrep(new, old, original)

B strrep(old, new, original)

C strrep(original, old, new)

D strrep(original, new, old)

The syntax is strrep(originalString, oldSubstring, newSubstring).

Explain how to replace a substring in a MATLAB string using strrep.

Think about the inputs and output of the function.

Describe what happens when the substring to replace does not exist in the original string in MATLAB's strrep.

Consider what the function returns if it finds nothing to replace.