title: Regular Expression in C#
body: <p>i want to validate the input of a text box so as not be empty and also to accept only decimal or integer.
  I have tried the following regex's:
  ^\S[0-9]<em>,?[0-9]</em>$  this one allows one letter at the beginning</p>
  
  <p>^\S[0-9]+,?[0-9]*$  this one althought that does not allow letters, it requires for at least 2 numbers which is not desired.</p>
  
  <p>thank you very much in advance for your time.</p>