How can I restrict a Letter

User Support Form Building
1

Dear Experts,

I want to restrict a word from Input.
For example,
Allow Input: 1001A0, 1002B1, 1003D3 etc (Allow input A-Z except for C)
Restrict Input: 1001C0

Thanks in Advanced

2

Welcome back to the community, @tanzilhuda! So, your requirement is something like a code where users are able to input the following:

  • 4 digit integer
  • Then a capital alphabet from A-Z (except C)
  • And another 1 digit integer

So the code should have a total of 6 characters (both integer and alphabets)?

3

Absolutely Yes. Would you help me with how can I write the code?

4

Should the first digit be 1 by default or could it be anything else?

5

Yes, first digit will be “1” by default.

6

OK, this regex code should help you solve your issue:

regex(., '^[1][0-9]{3}[(A-B)|(D-Z)][0-9]{1}$')

For details, please feel free to visit our support article Restricting Text Responses With Regular Expressions.

1 Like
7

Dear BOSS,

It’s working amazingly. Thank you so much. But if I want to use “^” what code will be?

Regards

8

Try using it inside the [ ] as [^] in one of the numbers.

9

I write this code: regex(., ‘^[1][0-9]{3}[(A-Z)^C][1-9]{4}$’)

But it is not working. Would you help me how can I write the code using “^”

10

OK, try using this regex code:

regex(., '^[1][0-9]{3}[^C][1-9]{4}$')

11

I write your code: regex(., ‘^[1][0-9]{3}[^C][1-9]{1}$’)
It is working amazingly. Thank you so much.

1 Like
12

Beware that:

  • [^C] allows any character not being “C”, including “c”, and not only letters. So I don’t think it applies here.
  • [(A-Z)^C] means “any character being between A and Z or not being C”. I think what you want is “and”.

So if I am not mistaken, the right formula is the first that @Kal_Lam suggested, or this simplified variant:
^1[0-9]{3}[A-B|D-Z][0-9]$

2 Likes