c# - Alphanumeric not working with underscore -

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I am using the following REGEX and what I need, only accept the following uncounted alphanumeric values ​​ 

  1. should not start with the number 2. Accept the underscores between the character 3. The value may be after the value   
 For example  
 aa_bb a1_a2  
 I tried with the following which is not working well:  
  @ "^ [a-zA-Z0 - 9] + (_ [A-zA-Z0- 9] +] * $ ",    
 
 
  @ "^ [A-zA-Z] [a-zA-Z0- 9 _.] + \ S? $"   
 Use this regex.  < P> There are many flaws in your regex  
     
  •   ^ [a-zA-Z0- 9] +  will allow numbers to begin the test string.  
  •  There is no space in the end so it will not allow space.   
     Demo here:

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