c# - Regex get error in textbox when having space at the end -

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I am using the following regex to verify the numbers which are working properly.
The problem is that if you enter the text box press a few valid numbers and then space , the expression is no longer valid.
How do I ignore the empty space at the end of the value entered by regex handling? 

  @ "^ [0-9] + $"    
 
 
  @ "^ [0-9] + \s * $"   
 In this way, you can take the position of zero or more at the end.  
  *  is a quantifier for this particular purpose

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