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Custom Field Validation


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I am new to Regular Expression Validation Strings, I am trying to implement a REQUIRED field whereby the client enters a FOUR DIGIT number so I can use it to verify it is them like with GoDaddy. I used the expression [0-9]{1-4} (My friend told me that) but it doesn't work and just comes up with "value is not valid".

I need an expression to validate that the value is an integer and is 4 digits in length.


Any help appreciated.

Thanks in advance!

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