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.
|
SHORTHAND |
DESCRIPTION |
|---|---|
|
{D} |
[0-9] |
|
{L} |
[A-Za-z] |
|
{SP} |
[(),;\.\\<>@\[\]:] |
|
{NUMBER} |
[0-9]+ |
|
{WORD} |
[A-Za-z]+ |
|
{CR} |
\r |
|
{LF} |
\n |
|
{LWSP} |
[ \t] |
|
{CRLF} |
(\r\n) |
|
{WSP} |
[ \t\f]+ |
|
{ALLC} |
. |
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.
|
META-SYMBOL |
DESCRIPTION |
|---|---|
|
\s |
[[:space:]] |
|
\S |
[^[:space:]] |
|
\d |
[[:digit:]] |
|
\D |
[^[:digit:]] |
|
\w |
[_[:alnum:]] |
|
\W |
[^_[:alnum:]] |
