|
EXPRESSION
|
DESCRIPTION
|
|
R?
|
Matches R, once or not at all
|
|
R*
|
Matches R, zero or more times
|
|
R+
|
Matches R, one or more times
|
|
R{n}
|
Matches R, exactly n times
|
|
R{n,}
|
Matches R, at least n times
|
|
R{n,m}
|
Matches R, at least n but no more than m times
|
R is a regular expression.
Trend Micro does not recommend using ".*" in a
regular expression. ".*" matches any length of letters and the large number of matches
may
increase memory usage and affect performance.
For example:
If the content is 123456abc, the regular expression ".*abc" match results are:
-
12345abc
-
23455abc
-
3456abc
-
456abc
-
56abc
-
6abc
-
abc
In this example, replace ".*abc" with "abc" to prevent excessive use of resources.