Shorthand and meta-symbol

Trend Micro Email Security provides the following shorthand for writing complicated regular expressions. Trend Micro Email Security will pre-process expressions and translate the shorthand into regular expressions.

For example, {D}+ would be translated to [0-9]+. If a shorthand expression is enclosed in brackets (example: {}) or double-quotes, then Trend Micro Email Security will not translate that shorthand expression to a regular expression.


















[ \t]




[ \t\f]+



Trend Micro Email Security also provides the following meta-symbols. The difference between shorthand and meta-symbols is that meta-symbols can be within a bracket expression.