Functions, procedures
function is_valid_email
function is_valid_email(
p_value in varchar2
) return boolean
returns true if value is valid email address
function is_valid_email2
function is_valid_email2(
p_value in varchar2
) return boolean
returns true if value is valid email address
function is_valid_email_list
function is_valid_email_list(
p_value in varchar2
) return boolean
returns true if value is valid email address list