Regex for a text field validation [closed]

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I am using JqueryValidationEngine to validate my forms on the client side.

I want to validate a text field using regex in a form. The condition is as follows

Edit:

Condition1:

It should not allow the user to enter single or multiple combinations of zeroes.

E.g. '0', '00,, '00000' etc.

Condition2:

It should not allow the user to enter the any multiple digit number starting with 0, but excluding the condition1. 

E.g. '01', '001, '001001' , '000001' etc.

I'm using rubular.com for checking the regex and I need two regex for not allowing the above two type of values. Thanks :)-

Answer 1

Condition 1 (updated according to OP's suggestion)

/^[1-9]\d*$/ 

Condition 2 (only digits with first 0 and atleast one non zero)

/^0+[1-9][0-9]*$/

Inverse of above

/^((?!^0+[1-9][0-9]*$).)*$/

Answer 2

Condition 1:

^\d*[1-9]\d*$

Condition 2:

^[1-9]\d*$

Answer 3

if exp =~ /^[0]+/
  'message 1'
elsif exp =~ /^0[01]*/ 
  'message 2'
end