column(separator(column))* For ABA pattern, e.g. abc,def,ghi
column(separator(column))*
abc,def,ghi
the column expression
the separator
Get expression of email addresses (Email Address Spec)[https://tools.ietf.org/html/rfc5322#section-3.4]
Test a string with a specific expression.
the expression
the tested string
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column(separator(column))*
For ABA pattern, e.g.abc,def,ghi