1. Selective Regular Expression Matching
Author:
Natalia Stakhanova, Hanli Ren, Ali A.Ghorbani
Publisher:
Information Security Conference 2010
Presenter:
Zi-Yang Ou
Date:
2012/04/25

2. Introduction
Instead of serially matching all regular expressions, we compile a set
of shortest patterns most frequently seen in regular expressions that
allows to quickly filter out events that do not match any of the IDS
signatures.

3. Introduction

4. Deriving Regex Patterns

5. Ensuring Matching Correctness

6. Optimizing Regex Tree -Rule Reduction

7. Optimizing Regex Tree -Pattern Reduction

8. Optimizing Regex Tree -Pattern Selection
The pattern selection aims to select an optimal set of root nodes.
We seek to minimize set of patterns such that every re RE is covered by at least one
Minimum set cover problem.
The algorithm selects a subset ( ) that covers the most of uncovered regular expressions.

9. Selective Matching Algorithm

10. Evaluation Results

11. Evaluation Results

12. Evaluation Results