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Trend Micro InterScan Messaging Security Virtual Appliance Administrator’s Guide
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Boundary Matches
EXPRESSION DESCRIPTION
^ Beginning of line
$ End of line
Greedy Quantifiers
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