What is the regex to match an alphanumeric 6 character string?

Question

I need regex for asp.net application to match an alphanumeric string at least 6 characters long.

Answer 1

I’m not familiar with ASP.NET. But the regular expression should look like this:

^[a-zA-Z0-9]{6,}$

^ and $ denote the begin and end of the string respectively; [a-zA-Z0-9] describes one single alphanumeric character and {6,} allows six or more repetitions.

Answer 2

I would use this:

^[\p{L}\p{N}]{6,}$

This matches Unicode letters (\p{L}) and numbers (\p{N}), so it's not limited to common letters the Latin alphabet.

Answer 3

^\w{6,}$ ^[a-zA-Z0-9]{6,}$

(Depending on the Regex implementation)

Note, that \w also matches _!