c# - Regular Expression almost perfect for a Numeric Value -

-

I have this regg almost correct ... it seems that except A number that happens with a negative signal and then decimals if I enter: 

  - 2.

I get an error I get it -

Here's my reggae - everything else 'I've totally tested ... 

  ^ (\ + | -)? [0- 9] {1,11}? (?: [[0- 9] {1,  
     
  •  Number to 11 digits (99 billion)  
  •  Positive or negative: $
  • up to 4 decimal places (optional)
  • Key 0 is optional before the decimal point - Only positive numbers

    • All these tasks: 

      -0.2345 -10 12.15 0.1245 5.555 25000000000 (aka 25 billion) 25000000000.25  < / Pre> 
     These do not work: 
     
      - 2-421

    Try this: 

      ^ (\ + | -)? [0- 9] {011}? (?: \. [0- 9 ] {1, 4})? $

    Up Aet:

    Accepts the above regex string + , - and (empty string). To prevent those people, use lookhead , the lookhead ensures that a letter should be followed by + or - .

    The correct solution is: 

      ^ (\ + | -)? (? =. {1}) [0- 9] {0,11} (?: [[0- 9] {1,4})? $ String  
      
     >  
     string not accepted:  
      100000000000.0001 + - 1234567890121111111111.12345 +1.1.1.1 -2

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