Regex not required

skander bjk :

I am trying to develop a simple REGEX in Java with pattern like that :

@Pattern(regexp = "[a-zA-Z]{2}[0-9]{1}[2-8]{1}" , message = "The format is invalid")

but this message is still displayed when the field is empty, so i want to show this message only when the field is not empty (i want that the field is will be not required).

Thank you.

Tim Biegeleisen :

Try using the following regex, which matches both your expected string and empty string:

[a-zA-Z]{2}[0-9]{1}[2-8]{1}|^$

Java code:

@Pattern(regexp = "[a-zA-Z]{2}[0-9]{1}[2-8]{1}|^$", message = "The format is invalid")

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