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[email protected]– email’s first character can not start with dot “.” 7.Regular expression helps you in pattern matching in string. : Matches any single charcter except a new line : Matches the preceding character or repeated character. The basic expression for matching entered value as number in the field is: /^[0-9] $/. [A-Z] : It matches characters from uppercase ‘A’ to lowercase ‘Z’. The codes for checking form empty fields are given below: There is an expression that checks whether the string contains only alphabets or not.when i mean validate i don't mean if the email address is currently active, mailbox is full, or if it's totally bogus. so it should have an '@' sign, should be like "[email protected]" or something like that. i've seen emails like "[email protected]" i believe so i can't discount those.so anybody know a good way to check for this and in the right way?