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}$/
Kindly help me in this case.
Asked
Active
Viewed 110 times
0
-
Why regex?! A couple of arithmetic comparisons would be better. – Biffen Apr 13 '16 at 10:34
-
Which language do you use? – pguetschow Apr 13 '16 at 10:35
-
3Possible duplicate of [Learning Regular Expressions](http://stackoverflow.com/questions/4736/learning-regular-expressions) – Biffen Apr 13 '16 at 10:36
-
i am using C#. According to system architecture , I need to do it with regex only. Kindly help me please. – Akki Bhogte Apr 13 '16 at 10:37
-
@AkkiBhogte Is it 500 or 555? – Biffen Apr 13 '16 at 10:48
2 Answers
3
What you need:
^([5-9]|\d\d|[1-4]\d\d|5[0-4]\d|55[0-5])$
It uses | to have 3 different statements to deal with 1-digit, 2-digit and 3-digit numbers.
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
Kaspar Lee
- 5,446
- 4
- 31
- 54
3
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])$
rock321987
- 10,942
- 1
- 30
- 43