c# - Regular expression with a limited length, spaces and other limitations -


i'm looking following regex:

  • the match can empty.
  • if not empty, must contain @ least 2 characters english letters or digits.
  • the regex must allow spaces between words.

this come with: 

^[a-za-z0-9]{2,}$

it works fine, not except spaces between words.

here, can use regex make sure match kind of spaces (even hard space), , make sure allow empty string match:

(?i)^(?:[a-z0-9]{2}[a-z0-9\p{zs}]*|)$

c#:

var rg11x = new regex(@"(?i)^(?:[a-z0-9]{2}[a-z0-9\p{zs}]*|)$"); var tst = rg11x.ismatch("");                // true var tst1 = rg11x.match("mc donalds").value; // mc donalds

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