match operator in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to check if the string contains the word 'hello' using the match operator.

PowerShell

$text = 'hello world'
if ($text [1] 'hello') {
    Write-Output 'Match found'
}

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

A-eq

B-match

C-like

D-contains

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-eq' which checks for exact equality, not pattern matching.

Using '-like' which uses wildcard matching but is different from '-match'.

The '-match' operator checks if the string on the left contains the pattern on the right.

2fill in blank

medium

Complete the code to find all words starting with 'a' in the array using the match operator.

PowerShell

$words = @('apple', 'banana', 'apricot', 'cherry')
$result = $words | Where-Object { $_ [1] '^a' }
Write-Output $result

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

A-match

B-eq

C-like

D-contains

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-like' which uses wildcards but not regex.

Using '-eq' which checks exact match.

The '-match' operator supports regular expressions, so '^a' matches words starting with 'a'.

3fill in blank

hard

Fix the error in the code to correctly check if the variable contains digits using the match operator.

PowerShell

$input = 'abc123'
if ($input [1] '\d+') {
    Write-Output 'Digits found'
}

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

A-like

B-contains

C-match

D-eq

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-like' which does not support regex.

Using '-contains' which is for collections, not strings.

The '-match' operator uses regex patterns like '\d+' to find digits in a string.

4fill in blank

hard

Fill both blanks to filter an array for strings that end with '.txt' using the match operator.

PowerShell

$files = @('doc1.txt', 'image.png', 'notes.txt', 'script.ps1')
$txtFiles = $files | Where-Object { $_ [1] [2] }
Write-Output $txtFiles

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

A-match

B'\.txt$'

C'*.txt'

D-like

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-like' with '*.txt' which works but is not the match operator.

Using '-match' with '*.txt' which is not a regex pattern.

Use '-match' with the regex '\.txt$' to find strings ending with '.txt'.

5fill in blank

hard

Fill all three blanks to create a hashtable of words and their lengths only if the word contains the letter 'e' using the match operator.

PowerShell

$words = @('tree', 'sky', 'bee', 'cloud')
$lengths = @{ }
foreach ($word in $words) {
    if ($word [1] [2]) {
        $lengths[[3]] = $word.Length
    }
}
Write-Output $lengths

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

A-match

B'e'

C$word

D-like

Attempts:

3 left

💡 Hint

Common Mistakes

Using '-like' instead of '-match' for regex matching.

Using a string literal instead of the variable as the hashtable key.

Use '-match' with pattern 'e' to check if the word contains 'e', then use the word as the key in the hashtable.

Practice

1. What does the PowerShell -match operator do?

easy

A. Replaces text in a string

B. Converts a string to uppercase

C. Splits a string into an array

D. Checks if a string contains a pattern using regular expressions

Solution

1. Step 1: Understand the purpose of -match

   The -match operator is used to check if a string contains a pattern using regular expressions.

2. Step 2: Compare with other string operations

   Replacing text, splitting strings, or changing case are done by other operators or methods, not -match.

3. Final Answer:

   Checks if a string contains a pattern using regular expressions -> Option D

4. Quick Check:

   -match checks pattern presence [OK]

Hint: Remember: -match finds patterns, not changes text [OK]

Common Mistakes:

• Confusing -match with -replace
• Thinking it splits strings
• Assuming it changes string case

2. Which of the following is the correct syntax to check if the variable $text contains the word "hello" using the match operator?

easy

A. $text -match "hello"

B. $text match "hello"

C. match $text "hello"

D. $text -matches "hello"

Solution

1. Step 1: Recall correct operator syntax

   The correct operator is -match placed between the variable and the pattern.

2. Step 2: Identify correct option

   $text -match "hello" uses $text -match "hello", which is the correct syntax. $text -matches "hello" uses -matches which is invalid.

3. Final Answer:

   $text -match "hello" -> Option A

4. Quick Check:

   Correct syntax uses -match between variable and pattern [OK]

Hint: Use -match exactly, no plural or missing dash [OK]

Common Mistakes:

• Using -matches instead of -match
• Omitting the dash before match
• Placing match before the variable

3. What is the output of this PowerShell code?

$text = "PowerShell is fun"
if ($text -match "fun") { "Yes" } else { "No" }

medium

A. No

B. True

C. Yes

D. False

Solution

1. Step 1: Evaluate the match condition

   The string "$text" contains the word "fun" so $text -match "fun" returns True.

2. Step 2: Determine the if statement output

   Since the condition is True, the if block returns "Yes".

3. Final Answer:

   Yes -> Option C

4. Quick Check:

   Pattern found, output is "Yes" [OK]

Hint: If pattern found, -match returns True [OK]

Common Mistakes:

• Confusing output with Boolean True/False
• Assuming output is the matched string
• Ignoring the if-else structure

4. Identify the error in this PowerShell snippet:

$string = "Hello World"
if ($string -match) { "Match found" } else { "No match" }

medium

A. Variable name is invalid

B. Missing pattern after -match operator

C. Incorrect use of if statement

D. Missing quotes around variable

Solution

1. Step 1: Check the -match usage

   The -match operator requires a pattern to match against, but none is provided here.

2. Step 2: Verify other syntax elements

   The variable name and if statement syntax are correct, and quotes around variable are not needed.

3. Final Answer:

   Missing pattern after -match operator -> Option B

4. Quick Check:

   -match needs a pattern [OK]

Hint: Always provide a pattern after -match [OK]

Common Mistakes:

• Leaving out the pattern to match
• Thinking variable needs quotes
• Misusing if statement syntax

5. You want to check if a string contains either "cat" or "dog" using -match. Which pattern correctly matches either word?

hard

A. "cat|dog"

B. "cat&dog"

C. "cat,dog"

D. "cat dog"

Solution

1. Step 1: Understand regex OR operator

   In regular expressions, the pipe symbol | means OR, so "cat|dog" matches either "cat" or "dog".

2. Step 2: Evaluate other options

   Options A, B, and C do not represent OR in regex and will not match either word correctly.

3. Final Answer:

   "cat|dog" -> Option A

4. Quick Check:

   Use | for OR in regex patterns [OK]

Hint: Use pipe | for OR in regex patterns [OK]

Common Mistakes:

• Using commas or spaces instead of |
• Using & which means AND in some contexts
• Not knowing regex syntax for OR