Common regex patterns in PowerShell - Cheat Sheet & Quick Revision

Recall & Review

beginner

What does the regex pattern \d match?

It matches any single digit from 0 to 9.

beginner

What is the purpose of the regex pattern \w+?

It matches one or more word characters (letters, digits, or underscore).

beginner

Explain the regex pattern ^abc$.

It matches the exact string 'abc' only, from start (^) to end ($) of the line.

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What does the regex pattern \s* match?

It matches zero or more whitespace characters (spaces, tabs, newlines).

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How does the regex pattern [a-zA-Z] work?

It matches any single letter from a to z or A to Z (case sensitive).

Which regex pattern matches a string that starts with 'cat'?

A cat$

B cat*

C \bcat\b

D ^cat

The caret (^) means the start of the string, so '^cat' matches strings starting with 'cat'.

What does the regex pattern \D match?

A Any digit

B Any non-digit character

C Any whitespace

D Any word character

\D matches any character that is NOT a digit.

Which pattern matches one or more digits in a row?

A \d+

B \d*

C \d?

D \d{0}

\d+ matches one or more digits consecutively.

What does [0-9a-fA-F] match?

A Any digit or letter a-f or A-F

B Only digits 0-9

C Only letters a-f

D Only uppercase letters

It matches any hexadecimal digit: digits 0-9 and letters a-f or A-F.

Which regex matches zero or more whitespace characters?

A \s+

B \S*

C \s*

D \s?

\s* matches zero or more whitespace characters.

List and explain three common regex patterns used to match digits, words, and whitespace.

Think about shortcuts for digits, letters, and spaces.

Describe how anchors like ^ and $ are used in regex patterns.

Anchors fix where the pattern should appear in the text.