java - Email validator regex -

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possible duplicate:
regexp recognition of email address hard?

hi,

i implement validator local part of email address.

any suggestions please welcome.

from email address article @ wikipedia (syntax section):

the local-part of email address may use of these ascii characters:

  • uppercase , lowercase english letters (a–z, a–z)
  • digits 0 9
  • characters ! # $ % & ' * + - / = ? ^ _ ` { | } ~
  • character . (dot, period, full stop) provided not first or last character, , provided not appear 2 or more times consecutively (e.g. john..doe@example.com).

the syntax formally defined in rfc 5322 section 3.4.1 , rfc 5321. defined grammar in local part starts this:

local-part      =   dot-atom / quoted-string / obs-local-part atext           =   alpha / digit /    ; printable us-ascii                    "!" / "#" /        ;  characters not including                    "$" / "%" /        ;  specials.  used atoms.                    "&" / "'" /                    "*" / "+" /                    "-" / "/" /                    "=" / "?" /                    "^" / "_" /                    "`" / "{" /                    "|" / "}" /                    "~"  atom            =   [cfws] 1*atext [cfws]  dot-atom-text   =   1*atext *("." 1*atext)  dot-atom        =   [cfws] dot-atom-text [cfws]  ...

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