-replace operator in PowerShell - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this PowerShell command using -replace?

Consider the following command:

$text = 'Hello World!'; $text -replace 'World', 'PowerShell'

What will be the output?

PowerShell

$text = 'Hello World!'; $text -replace 'World', 'PowerShell'

A Hello World!

B Hello PowerShell!

C PowerShell World!

D HelloWorld!

💡 Hint

The -replace operator replaces the first string with the second in the original text.

The -replace operator searches for the pattern 'World' and replaces it with 'PowerShell', so the output is 'Hello PowerShell!'.

💻 Command Output

intermediate

What does this -replace command output when using regex?

Given this command:

'abc123def' -replace '\d+', 'XYZ'

What is the output?

PowerShell

'abc123def' -replace '\d+', 'XYZ'

A abc\d+def

B abc123def

C XYZ

D abcXYZdef

💡 Hint

The pattern '\d+' matches one or more digits.

The regex '\d+' matches '123' and replaces it with 'XYZ', so the output is 'abcXYZdef'.

📝 Syntax

advanced

Which option correctly uses -replace to remove all vowels from a string?

You want to remove all vowels (a, e, i, o, u) from the string 'PowerShell'. Which command does this correctly?

A 'PowerShell' -replace '[aeiou]', ''

B 'PowerShell' -replace '[aeiou]+'

C 'PowerShell' -replace '[aeiou]'

D 'PowerShell' -replace '', '[aeiou]'

💡 Hint

The -replace operator needs both a pattern and a replacement string.

Option A correctly uses a regex pattern to match vowels and replaces them with an empty string, removing them.

🔧 Debug

advanced

Why does this -replace command cause an error?

Look at this command:

'Hello123' -replace 123, 'ABC'

Why does it cause an error?

PowerShell

'Hello123' -replace 123, 'ABC'

A Because -replace cannot handle numbers in the pattern

B Because the replacement string is missing

C Because the pattern must be a string or regex, not a number

D Because the input string is not quoted

💡 Hint

Check the type of the pattern argument.

The pattern argument must be a string or regex pattern. Using a number causes a type error.

🚀 Application

expert

How many replacements occur with this command?

Given this command:

'aaaabbbb' -replace 'a', 'x'

How many characters are replaced?

PowerShell

'aaaabbbb' -replace 'a', 'x'

A 4

B 8

C 1

D 0

💡 Hint

The -replace operator replaces all matches by default.

The pattern 'a' matches all four 'a' characters and replaces each with 'x', so 4 replacements occur.