Java Email Validation for UTF

I need to ma开发者_开发百科ke sure email is valid . And also I need to check that there is no weired UTF charactes in it . I am dont with validating it for validation with regular expression

^(([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5}){1,25})+([;.](([a-zA-Z0-9_\-\.]+)@([a-zA-Z0-9_\-\.]+)\.([a-zA-Z]{2,5}){1,25})+)*$

But how do I check it for UTF ?

Thanks

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Are you trying to make sure it's valid w.r.t. RFC 5335 section 4.1?

If so, you can only check that a byte[] is valid UTF-8. It doesn't make sense to try to verify a sequence of UTF-16 code units (Java chars) or code-points is valid UTF-8 since UTF-8 is a byte-string to codepoint-string mapping and UTF-16 is a mapping from code-units->unicode-scalar-values. Section 3.9 of "Unicode Encoding Forms" explains all this.

The best way to tell whether a byte[] is a well formed UTF-8 sequence is to use one of the built in decoders, e.g. StandardCharsets.UTF8 or the Guava equivalent Charsets.UTF8.

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If you want to make sure there are only ASCII characters in your email address, you can use that pattern:

"[^\\x00-\\x7F]"

It will mach any non-ascii character.