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Tcl/Tk 8.5 Programming Cookbook

You're reading from   Tcl/Tk 8.5 Programming Cookbook With over 100 recipes, this Cookbook is ideal for both beginners and advanced Tcl/Tk programmers. From the basics to creating applications, it’s full of indispensable tips and tricks to make the most of the language.

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Product type Paperback
Published in Feb 2011
Publisher Packt
ISBN-13 9781849512985
Length 236 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (20) Chapters Close

Tcl/Tk 8.5 Programming Cookbook
Credits
About the Author
1. Acknowledgment
About the Reviewers
2. www.PacktPub.com
3. Preface
1. The Tcl Shell FREE CHAPTER 2. Using the Building Blocks Control Constructs 3. Error Handling 4. Handling String Expressions 5. Expanding String Functionality Using Lists 6. The Tcl Dictionary 7. File Operations 8. Tk GUI Programming with Tcl/Tk 9. Configuring and Controlling Tk Widgets 10. Geometry Management 11. Using Tcl Built-in Dialog Windows 12. Creating and Managing Menus 13. Creating the Address Book Application

Locating a pattern within a string


Many times, you may have the need to determine if a specific pattern exists within a string. To accomplish this, Tcl provides the match keyword. Let's look at the syntax and then I will explain the major differences and the real strength of this keyword.

The string syntax is as follows:

string match nocase pattern string

When invoked with the match keyword, the string command will attempt to locate the pattern specified.

The following details the various methods in which the pattern can be passed and illustrates the special characters the pattern can store.

Special Characters

Description

*

Matches any sequence within the string, including null strings.

?

Matches any single character in the string.

[characters]

Matches any character in the set provided.

If chars contains a sequential notation of the form a-f, then any characters between a and f (a and f inclusive) will result in a match.

\x

Matches the character specified in x.

This avoids...

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