Which pattern does the following regular expression recover? (\d{4})[\\]\)-](3)(\d{4})

Question

Options

• A000-000-0000
• Bddd-4-3-dddd-4-3
• C000-00000-000-ABC
• D0000-0000-0000-0000

• A
  14% (9)
• B
  5% (3)
• C
  9% (6)
• D
  72% (47)

Explanation

Option D (0000-0000-0000-0000) is correct because the regex contains \d{4}, which matches exactly 4 consecutive digits - and D is the only choice structured entirely around 4-digit groups, consistent with a credit card number format.

Why the distractors fail:

• A (000-000-0000) uses 3-3-4 digit groupings; the leading group has only 3 digits, failing \d{4} which requires exactly 4.
• B (ddd-4-3-dddd-4-3) is a meta-description of a pattern, not a literal string - \d only matches numeric characters, not letters like d.
• C (000-00000-000-ABC) fails on two counts: its digit groups are not consistently 4 digits, and it contains alphabetic characters (ABC) which \d cannot match.

Memory tip: Whenever you see \d{n} in a regex, read it as "exactly n digits in a row." \d{4} → "four-digit block" - picture the four groups on a credit card, and D will always come to mind first.

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