how can we define email validation. can we give without regex expression?
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Why wouldn't you want to use RegEx? The (very very) old thread Vikash already linked for you will contain my (very very) old-but-still-working OOB expression rule that handles basic email address validation, however the Regex solution is quite a bit more powerful.
is there any alternative of RegEx ?
NeilTheodus said:is there any alternative of RegEx ?
Can you clarify what you're after here, and why? As I mentioned already, the thread linked above contains a non-Regex solution I posted here *years* ago, but there's no good reason to not use the Regex plugin IMHO.