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Go Systems Programming

You're reading from   Go Systems Programming Master Linux and Unix system level programming with Go

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Product type Paperback
Published in Sep 2017
Publisher Packt
ISBN-13 9781787125643
Length 466 pages
Edition 1st Edition
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Author (1):
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Mihalis Tsoukalos Mihalis Tsoukalos
Author Profile Icon Mihalis Tsoukalos
Mihalis Tsoukalos
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Toc

Table of Contents (13) Chapters Close

Preface 1. Getting Started with Go and Unix Systems Programming FREE CHAPTER 2. Writing Programs in Go 3. Advanced Go Features 4. Go Packages, Algorithms, and Data Structures 5. Files and Directories 6. File Input and Output 7. Working with System Files 8. Processes and Signals 9. Goroutines - Basic Features 10. Goroutines - Advanced Features 11. Writing Web Applications in Go 12. Network Programming

Using regular expressions

This section will illustrate how to add support for regular expressions in finalFind.go: the name of the last version of the tool will be regExpFind.go. The new flag will be called -re and it will require a string value: anything that matches this string value will be included in the output unless it is excluded by another command-line option. Additionally, due to the flexibility that flags offer, we do not need to delete any of the previous options in order to add another one!

Once again, the diff(1) command will tell us the code differences between regExpFind.go and finalFind.go:

$ diff regExpFind.go finalFind.go
8d7
<     "regexp"
36,44d34
< func regularExpression(path, regExp string) bool {
<     if regExp == "" {
<           return true
<     }
<     r, _ := regexp.Compile(regExp)
<     matched := r.MatchString...
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