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Deepika TestDeepika Test 

Email field validation in lightning

a) ',' must Not exist (comma)
b) ';' must Not exist (semi colon)
c) '.' must exist (full stop)
d) @ must exist and exist only once.
e) length must >= 5
f) ' ' must Not exist (space)
g) no Chinese
h) after @, only allows letter, numbers, dash [-] (e.g. bu404024@hkpucc_pou.hk will be treated as invalid input)
i) do not allow punctuation marks at the END of email address ( e.g. fung@manulife.com`` )
j) characters must exists before @ 
Thanks
Rahul KumarRahul Kumar (Salesforce Developers) 
Hi Deepika,

May I suggest you please refer the below link for reference on email field validation. Hope it helps.

Thanks
Rahul Kumar