Regex with Select-String in PowerShell - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the <code>Select-String</code> cmdlet do in PowerShell?

It searches through text or files for patterns that match a regular expression (regex) and returns the matching lines.

beginner

How do you use Select-String to find the word 'apple' in a file named fruits.txt?

Use the command: <br>Select-String -Path fruits.txt -Pattern 'apple'<br>This searches for 'apple' in the file and shows matching lines.

beginner

What is a regular expression (regex) in simple terms?

A regex is like a search pattern made of special characters that helps find text that fits a certain shape or rule, like all words starting with 'a'.

intermediate

How can you make Select-String search case-insensitively?

By default, Select-String is case-insensitive. To make it case-sensitive, add the -CaseSensitive switch set to $true. The -NotMatch switch is used for inverse matching.

beginner

What does the output of Select-String include when it finds a match?

It shows the file name, the line number, and the text of the line where the match was found.

Which cmdlet is used to search text using regex in PowerShell?

A Search-File

B Get-Content

C Find-Text

D Select-String

Select-String is the PowerShell cmdlet designed for searching text with regex patterns.

What does the pattern ^a match in Select-String?

A Lines ending with 'a'

B Lines starting with 'a'

C Any 'a' in the line

D Lines containing the word 'a'

The caret ^ means the start of a line, so ^a matches lines that start with 'a'.

How do you search multiple files with Select-String?

A Use wildcards in the -Path parameter

B Run the command multiple times

C Use the -FileList parameter

D It cannot search multiple files

You can use wildcards like *.txt in the -Path parameter to search many files at once.

What switch makes Select-String return lines that do NOT match the pattern?

A -NoMatch

B -Exclude

C -NotMatch

D -InvertMatch

The -NotMatch switch returns lines that do not match the regex pattern.

If you want to find the word 'cat' regardless of case, which command is correct?

A Select-String -Pattern 'cat'

B Select-String -Pattern 'cat' -CaseSensitive

C Select-String -Pattern 'cat' -CaseSensitive:`$false

D Select-String -Pattern 'CAT' -CaseSensitive

By default, Select-String searches case-insensitively, so just -Pattern 'cat' works.

Explain how you would use Select-String to find all lines containing a phone number pattern in a text file.

Think about how phone numbers look and how regex can match digits and separators.

Describe the output you get from Select-String when it finds matches and how you can use that output.

Imagine you are looking for a word in many files and want to know exactly where it is.