Regex with Select-String in PowerShell - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to search for the word 'error' in the file 'log.txt'.

PowerShell

Select-String -Path 'log.txt' -Pattern '[1]'

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

Ainfo

Bwarning

Cerror

Ddebug

Attempts:

3 left

💡 Hint

Common Mistakes

Using double quotes instead of single quotes.

Searching for a word not present in the file.

The pattern 'error' will match lines containing the word 'error' in the file.

2fill in blank

medium

Complete the code to search for lines that start with 'Error' in 'log.txt'.

PowerShell

Select-String -Path 'log.txt' -Pattern '[1]'

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

A^Error

BError$

CError

D^error$

Attempts:

3 left

💡 Hint

Common Mistakes

Using '$' which matches end of line instead of start.

Not using anchors and matching anywhere in the line.

The regex '^Error' matches lines starting with 'Error'.

3fill in blank

hard

Fix the error in the code to find lines containing digits in 'data.txt'.

PowerShell

Select-String -Path 'data.txt' -Pattern '[1]'

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

A\w+

B\d+

C[0-9]+

D[a-z]+

Attempts:

3 left

💡 Hint

Common Mistakes

Using single backslash '\d' which is not escaped properly.

Using character classes that do not match digits.

The pattern '\d+' matches one or more digits. Double backslash is needed to escape in PowerShell strings.

4fill in blank

hard

Fill both blanks to find lines with exactly 3 letters followed by 2 digits in 'file.txt'.

PowerShell

Select-String -Path 'file.txt' -Pattern '[1][2]'

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

A^[a-zA-Z]{3}

B\d{2}$

C\d{3}$

D^[0-9]{3}

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up the order of letters and digits.

Using wrong quantifiers for number of characters.

The pattern '^[a-zA-Z]{3}\d{2}$' matches lines starting with 3 letters and ending with 2 digits.

5fill in blank

hard

Fill all three blanks to find lines containing a word starting with 'a' and ending with 'z' in 'text.txt'.

PowerShell

Select-String -Path 'text.txt' -Pattern '[1][2][3]'

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

A\ba

B.*

Cz\b

D\w+

Attempts:

3 left

💡 Hint

Common Mistakes

Not using word boundaries '\b'.

Using '+' instead of '*' causing no match for empty middle.

The pattern '\ba.*z\b' matches words starting with 'a' and ending with 'z'. '\b' marks word boundaries.