Effective Perl Programming: Ways to Write Better, More Idiomatic Perl, Second Edition > Regular Expressions

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Effective Perl Programming: Ways to Write Better, More Idiomatic Perl, Second Edition

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Ch. 1. The Basics of Perl

Ch. 2. Idiomatic Perl

Ch. 3. Regular Expressions

Item 28. Know the precedence of regular expression operators

Item 29. Use regular expression captures

Item 30. Use more precise whitespace character classes

Item 31. Use named captures to label matches

Item 32. Use noncapturing parentheses when you need only grouping

Item 33. Watch out for the match variables

Item 34. Avoid greed when parsimony is best

Item 35. Use zero-width assertions to match positions in a string

Item 36. Avoid using regular expressions for simple string operations

Item 37. Make regular expressions readable

Item 38. Avoid unnecessary backtracking

Item 39. Compile regexes only once

Item 40. Pre-compile regular expressions

Item 41. Benchmark your regular expressions

Item 42. Don’t reinvent the regex

Ch. 4. Subroutines

Ch. 5. Files and Filehandles

Appx. A. Perl Resources

Appx. B. Map from First to Second Edition

Index

3. Regular Expressions

Perl’s regular expressions are a language unto themselves, and that language seems almost as complex as Perl, perhaps even more so.

You don’t have to use everything, but there are some features of regular expressions that will make your life much easier. This chapter shows you some of their more-popular features.

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Contents

Chapter 3. Regular Expressions

3. Regular Expressions