how i set this pattern regex to the input?-CodePudding

How I set this pattern to the regex input?

until three number digits only ex: 0, 1, 12, 123, 555, 123, 456,102,10
accept zero, but just in the begginin without next numbers: this is ok >> 0
but not this >> 01, 05,06, or 066, 072;

Anyone can Help?

CodePudding user response：

Try to use this function

const zeroPad = (number, length = 2) => { 
     number = String(number); 
  
     while (number.length < length) { 
         number = `0${number}`; 
     } 
  
     return number; 
}

Number is your number argument, Length is your number length

CodePudding user response：

^(?!0.)\d{1,3}$

1 to 3 digit numbers. Except numbers with more than one digit whose first digit is 0: ^(?!0.)