I need a regex for the following pattern:

  • Total of 5 characters (alpha and numeric, nothing else).

  • first character must be a letter (A, B, or C only)

  • the remaining 4 characters can be number or letter.

Clarifcation: the first letter can only be A, B, or C.

Examples:

  • A1234 is valid
  • D1234 is invalid
regex
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