Common regex patterns in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if a string contains only digits using regex.

PowerShell

$string = "12345"
if ($string -match "^[1]$") {
    Write-Output "Only digits"
}

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A\d+

B\w+

C\s+

D\D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using \w+ matches letters and digits, not digits only.

Using \s+ matches whitespace, not digits.

The pattern \d+ matches one or more digits. Anchors ^ and $ ensure the entire string is digits only.

2fill in blank

medium

Complete the code to find all words starting with a capital letter.

PowerShell

$text = "Hello World from PowerShell"
$matches = [regex]::Matches($text, "\b[1]\w*")
$matches | ForEach-Object { $_.Value }

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A\d

B[a-z]

C[A-Z]

D\s

Attempts:

3 left

💡 Hint

Common Mistakes

Using [a-z] matches lowercase letters, not capital letters.

Using \d matches digits, not letters.

The pattern [A-Z] matches any uppercase letter at the start of a word boundary \b.

3fill in blank

hard

Fix the error in the regex pattern to match email addresses.

PowerShell

$email = "[e-mail]"
if ($email -match "^[\w.-]+@[1]\.[a-z]{2,}$") {
    Write-Output "Valid email"
}

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A[\w-]+

B[\d]+

C[\s]+

D[A-Z]+

Attempts:

3 left

💡 Hint

Common Mistakes

Using [\d]+ matches only digits, not domain names.

Using [\s]+ matches spaces, invalid in emails.

The pattern [\w-]+ matches the domain part of the email (letters, digits, underscore, hyphen).

4fill in blank

hard

Fill both blanks to create a regex that matches a US phone number format (e.g., 123-456-7890).

PowerShell

$phone = "123-456-7890"
if ($phone -match "^[1]-[2]-\d{4}$") {
    Write-Output "Valid phone number"
}

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A\d{3}

B\w{3}

C\d{4}

D\s{3}

Attempts:

3 left

💡 Hint

Common Mistakes

Using \w{3} matches letters and digits, not just digits.

Using \s{3} matches spaces, not digits.

The pattern \d{3} matches exactly three digits for the first two parts of the phone number.

5fill in blank

hard

Fill both blanks to create a regex that matches a hex color code (e.g., #1A2B3C).

PowerShell

$color = "#1A2B3C"
if ($color -match "^[1][2]$") {
    Write-Output "Valid hex color"
}

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A#

B[0-9A-Fa-f]{6}

C[0-9A-Fa-f]

D[A-Fa-f0-9]{3}

Attempts:

3 left

💡 Hint

Common Mistakes

Using [A-Fa-f0-9]{3} matches only 3 digits, not 6.

Missing the # at the start.

The pattern starts with #, followed by 6 hex digits ([0-9A-Fa-f]{6}).