How to add dot to regex

问题

@Pattern(regexp="^\\w{8,}")
private String username;

This pattern can only consist of numbers, letters and the underscore character.

How can I add the dot (.) to the pattern

Thanks

回答1:

Try this, it might be easier to understand if you explicitly define all valid characters:

@Pattern(regexp="^[A-Za-z0-9_.]{8,}")
private String username;

回答2:

You need to add end of the line anchor also.

@Pattern(regexp="^[.\\w]{8,}$")

来源：https://stackoverflow.com/questions/29515276/how-to-add-dot-to-regex