Why regex enables pattern matching in PowerShell - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the string contains the word 'cat'.

PowerShell

$text = 'The cat sat on the mat'
if ($text -match [1]) {
    Write-Output 'Match found'
}

Drag options to blanks, or click blank then click option'

A'cat'

B'rat'

C'bat'

D'dog'

Attempts:

3 left

💡 Hint

Common Mistakes

Using a word not present in the string, so no match occurs.

The -match operator checks if the string contains the pattern. Here, 'cat' is the pattern to find.

2fill in blank

medium

Complete the code to find if the string starts with a digit using regex.

PowerShell

$text = '9 lives'
if ($text -match [1]) {
    Write-Output 'Starts with a digit'
}

Drag options to blanks, or click blank then click option'

A'^\d'

B'[a-z]'

C'\d$'

D'^cat'

Attempts:

3 left

💡 Hint

Common Mistakes

Using \d$ which checks for digit at the end, not start.

The regex ^\d means the string starts (^) with a digit (\d).

3fill in blank

hard

Fix the error in the regex pattern to match any word ending with 'ing'.

PowerShell

$text = 'I am running fast'
if ($text -match [1]) {
    Write-Output 'Found a word ending with ing'
}

Drag options to blanks, or click blank then click option'

A'\w+ing$'

B'\bing\b'

C'ing$'

D'\w+ing\b'

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'ing$' matches only if 'ing' is at the end of the string, not word.

The pattern \w+ing\b matches words ending with 'ing'. \w+ means letters before 'ing', and \b is word boundary.

4fill in blank

hard

Fill both blanks to create a regex that matches strings with exactly 3 digits.

PowerShell

$text = 'My code is 123'
if ($text -match [1]) {
    Write-Output 'Contains exactly 3 digits'
}

$pattern = [2]

Drag options to blanks, or click blank then click option'

A'\b\d{3}\b'

B'\d{2}'

C'\d{3}'

D'\b\d{2}\b'

Attempts:

3 left

💡 Hint

Common Mistakes

Using {2} matches only 2 digits, not 3.

The pattern \b\d{3}\b matches exactly 3 digits as a whole word. \d{3} means 3 digits in a row.

5fill in blank

hard

Fill all three blanks to create a hashtable of words and their lengths for words longer than 4 letters.

PowerShell

$words = @('apple', 'bat', 'grape', 'kiwi')
$lengths = @{ [1] : [2] for [3] in $words if $[3].Length -gt 4 }
Write-Output $lengths

Drag options to blanks, or click blank then click option'

A$word

B$word.Length

Cword

Dw

Attempts:

3 left

💡 Hint

Common Mistakes

Using inconsistent variable names causing errors.

The hashtable comprehension uses word as the key, $word.Length as the value, and iterates over word in $words. It filters words longer than 4 letters.