Regex quantifiers and anchors in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to match any string that starts with 'Hello'.

PowerShell

$pattern = "[1]Hello"

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

A*

B$

C^

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using $ which anchors to the end of the string.

Using * or + which are quantifiers, not anchors.

The caret ^ is used to anchor the pattern to the start of the string.

2fill in blank

medium

Complete the code to match any string that ends with 'World'.

PowerShell

$pattern = "World[1]"

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

A$

B^

C?

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using ^ which anchors to the start of the string.

Using quantifiers like + or ? which do not anchor.

The dollar sign $ anchors the pattern to the end of the string.

3fill in blank

hard

Fix the error in the regex pattern to match one or more digits.

PowerShell

$pattern = "\d[1]"

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

A*

B+

C?

D{1,}

Attempts:

3 left

💡 Hint

Common Mistakes

Using * which means zero or more, allowing empty matches.

Using ? which means zero or one, not enough for multiple digits.

The plus sign + means one or more of the preceding element.

4fill in blank

hard

Fill both blanks to create a regex that matches exactly three letters at the start of a string.

PowerShell

$pattern = "[1][a-zA-Z][2]"

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

A^

B+

C{3}

D$

Attempts:

3 left

💡 Hint

Common Mistakes

Using $ which anchors to the end instead of start.

Using + which means one or more, not exactly three.

The caret ^ anchors to the start, and {3} means exactly three repetitions.

5fill in blank

hard

Fill all three blanks to create a regex that matches a string starting with 'ID' followed by 4 to 6 digits and ending immediately.

PowerShell

$pattern = "[1]ID\d[2][3]"

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

A^

B{4,6}

C$

D+

Attempts:

3 left

💡 Hint

Common Mistakes

Using + which means one or more, not a range.

Missing anchors causing partial matches.

^ anchors to start, {4,6} matches 4 to 6 digits, and $ anchors to end.