Packet Payload Monitoring for Internet Worm Content Detection Using Deterministic Finite Automaton with Delayed Dictionary Compression

Table 2

Patterns for regular expression.

Syntax	Meaning	Example
	At the beginning, the pattern should be matched with this input.	FH Shows FH starts with this pattern as input. F with this pattern “”, matches FH anywhere in the input.
	OR relationship	FH Represents F or H.
.	A single character wildcard	F. Represents end of the string.
?	Representing one or less quantifier	F? Represents F or an empty string.
*	Representing zero or more quantifier	F^* Denotes an arbitrary number of Fs.
	Repeat	F{200} Means 200 Fs.
	A class of characters	ejk Represents a letter , j, or k.
	Anything but	Represents any character; But not .