Quiz · 5 questions
🔤 Character Classes & Basics
Building blocks: literals, dots, classes, anchors, boundaries
Level 0Pattern-Curious
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Quiz
01Which class matches a single hex digit (case-insensitive)?
Hint
Hex needs 0-9 AND letters A-F.
02Which character does
. NOT match by default?Hint
What does the dot famously NOT match?
03What's wrong with
[A-z] as a way to match any letter?Hint
ASCII codepoint order matters.
04What's the difference between
.* and [^x]* on a multi-line input?Hint
Negated classes don't have the dot's no-newline rule.
05Which option correctly describes
\b?Hint
Zero-width — checks position, not character.
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