[JDEV] JID Validation using REGEX

[Sebastian Vollnhals]

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> chris at jabber.org/laptop
> chris/laptop
> jabber.org
> chris at jabber.org

chris at localhost is also possible ;O)

- -- 
 \|/ ____ \|/         | sebastian vollnhals       5D0D C03D
 '@"/ ., \"@'     web | http://home.yetzt.org     0DDB 2200
 /_| \_ / |_\  jabber | yetzt at jabber.org          FEB5 C7C9
    \__U_/        fon | +49 162 9025114           7B5A F013
 don't panic!  gpgkey | 0x6F65196C | fingerprint: AF16 CA8E
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iD8DBQE/G+tge1rwE68Wyo4RAgMyAJ9vwA3UaZ5mNKNttupeY2ZesGXloQCffUvf
0mmZtdQMBztQjrFAoFa2ntE=
=k7+j
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