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Regex Patterns Every Developer Should Know Practice Exam

Test yourself under real exam conditions: 50 timed questions, 60 on the clock, pass mark 70%%. Instant score with a full review of everything you got wrong. Free — no account needed.

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Exam details

  • ✓50 questions drawn from 120 cards
  • ✓Countdown timer — auto-submits when time runs out
  • ✓Pass mark 70% (real certification threshold)
  • ✓Full review of wrong answers at the end
  • ✓No signup required — save your score with a free account

Sample Questions

5 shown

What does the regex metacharacter . match by default?

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A single character of any kind except the newline character (\n). To make it also match newlines, use the s (dotall / single-line) flag, e.g. /foo.bar/s in JavaScript or re.DOTALL in Python.

Which character class matches any single digit in most regex flavors?

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[0-9] or the shorthand \d. \d is equivalent to [0-9] in ASCII; with Unicode (u flag in JS, default in Python 3 str) it matches any Unicode decimal digit, e.g. Arabic-Indic digits.

What does the shorthand \w match?

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Any word character. In ASCII mode this is [A-Za-z0-9_]; in Unicode mode it also matches letters and digits from other scripts, and the underscore.

What does the shorthand \s match?

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Any whitespace character: space, tab (\t), newline (\n), carriage return (\r), form feed (\f), and vertical tab (\v). In Unicode mode it can also match rare whitespace like the non-breaking space U+00A0.

How do you match a literal dot in a regex?

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Escape it with a backslash: \.. Inside a character class the dot is literal even without escaping, but \. still works and is the safe habit.

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