Regular Expressions GPYC Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   Why is it recommended to use raw strings (r'...') when writing regex patterns in Python?

   • ARaw strings make the regex pattern case-insensitive.
   • BRaw strings allow the use of unescaped metacharacters.
   • CRaw strings prevent Python from interpreting backslashes as escape sequences.
   • DRaw strings automatically compile the pattern.
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2. 2application · easy

   A data analyst needs to find all occurrences of the word `error` in a log, but only when it is NOT part of a longer word like `error404` or `error_handler`. Which regex pattern achieves this?

   • Ar'error'
   • Br'\berror\b'
   • Cr'^error$'
   • Dr'(?<!\w)error(?!\w)'
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4. 3foundation · easy

   In the pattern r'(\d{3})-(\d{4})', what does group(1) contain when matched against '555-1234'?

   • A'555-1234'
   • BNone
   • C'1234'
   • D'555'
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5. 4foundation · easy

   Which character class in a regular expression matches any single digit?

   • A\w
   • B\s
   • C\d
   • D\b
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6. 5foundation · easy

   Which flag passed to re.compile() makes the pattern match case-insensitively?

   • Are.MULTILINE
   • Bre.DOTALL
   • Cre.IGNORECASE
   • Dre.VERBOSE
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