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CyberSoft CVDL Tutorial

by Rick Perry
16 September 2001

Table of Contents

1. Introduction

2. VDL Format

3. String and Logic Examples

4. XOR and NOT

5. Concatenation and Offsets

6. White space

7. Absolute Offsets

8. Phone Numbers

9. Digits

10.Only Digits

11.| (Low-level Or)

12.Byte Expressions

13.Fuzzy Expressions

14.Repetition Expressions

15.Defining VDL Macros

16.Using VDL Macros

17.VDL Macro Examples

18.File Type Restriction Directives

19.File Type Restriction Examples

20.VDL Version Reporting

21.VFind --vdlc= Option

22.CVDL Syntax Summary

11. | (Low-level Or)

The low-level or operator | specifies the occurrence of patterns at a position relative to the preceding pattern in the scanned data.

For example:

  "x", ("a" | "b"), "y"

    matches "x", followed by "a" or "b", followed by "y"
    at some position in the scanned data.

Do not confuse the low-level | operator with the high-level OR operator. The high-level OR operator specifies the occurrence of patterns at any positions in the scanned data.

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