Regex code for any string containing BOTH letters AND digits and possibly underscores and dashes

Question

My regex knowledge is pretty limited, but I\'m trying to write/find an expression that will capture the following string types in a document:

DO match:

Answer 1

You can use the following expression with the case-insensitive mode:

\b((?:[a-z]+\S*\d+|\d\S*[a-z]+)[a-z\d_-]*)\b

Explanation:

\b                   # Assert position at a word boundary
(                    # Beginning of capturing group 1
  (?:                # Beginning of the non-capturing group
    [a-z]+\S*\d+     # Match letters followed by numbers
    |                # OR
    \d+\S*[a-z]+     # Match numbers followed by letters
  )                  # End of the group
  [a-z\d_-]*         # Match letter, digit, '_', or '-' 0 or more times
)                    # End of capturing group 1
\b                   # Assert position at a word boundary

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