CODEWITHSUNDEEP
regex
Akki Bhogte
Akki Bhogte

Reputation: 43

Regex - accept value between 5 and 555

I have a text box. This text box should accept only values between 5 and 555. But I am unable to achieve it.

I have tried the below:

/^[0-9]{5, 500}$/

Kindly help me in this case.

Upvotes: 0

Views: 122

Answers (2)

rock321987
rock321987

Reputation: 11042

This should work (though not recommended)

^(55[0-5]|5[0-4][0-9]|[1-4][0-9][0-9]|[1-9][0-9]|[5-9])$

Regex Demo

Proof of correctness

Upvotes: 3

Kaspar Lee
Kaspar Lee

Reputation: 5596

What you need:

^([5-9]|\d\d|[1-4]\d\d|5[0-4]\d|55[0-5])$

It uses | to have 3 different statements to deal with 1-digit, 2-digit and 3-digit numbers.

Live Demo on Regex101

How it works:

^          # String starts with ...
(
  [5-9]      # 1-Digit - Any digit 5 or over (5 to 9)
  |          # OR
  \d\d       # 2-Digit - Any 2 digits (since any 2-digit number will be within your range)
  |          # OR
  [1-4]\d\d  # 3-Digit (below 500) - Any digit 1 to 5 (100 to 500), followed by any 2 digits
  |          # OR
  5[0-4]\d   # 3-Digit (above 500, below 550) - 5, followed by any digit 0 to 4 (500 to 540),
             # followed by any digit
  |          # OR
  55[0-5]    # 3-Digits (550 or above) - 55, followed by any digit 0 to 5 (550 to 555)
)
$          # ... String ends with

Upvotes: 3

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