javascript - How to allow space in numeric regular expression? -

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I want to validate the 'int' field with javascript regular expression.

I am using this RE string 

  var number = / ^ [0- 9] + $ / /   
 This expression does not allow spaces in the text box.  
 How can I create a regular expression that allows spaces in the text box?   
 
 
 Add an optional location with:  
  var number = / ^ \ S * [0- 9] + \ s * $ /;

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