Regex to match exactly 6 digits with any number of spaces between the digits

Question

I recently needed to create a regular expression for OTP values in JavaScript. The input should contain 6 digits with spaces any where in between. I am not regex-savvy at all and even though I tried looking for a better way, I ended up with this:

/^[\d ]*$/

With this I can have spaces with digits but here I don't have control over the number of digits.

Answer 1

Try this:

let OTPs = [
  "123456", 
  "12345", // Invalid
  "1 2345 6", 
  "1 2 3 4 5 6", 
  "1 2 3 4    5 6",
  "a 2 b 4 5 6" // Invalid
]

let validOTPs = OTPs.filter(otp => otp.match(/^(\d\s*){6}$/g))
     
console.log(validOTPs)