Join Bill Weinman for an in-depth discussion in this video Matching classes of characters, part of Perl 5 Essential Training.
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- [Voiceover] Regular expressions include the ability…to match a class of characters…like any alphabetic character or any…of the digits four, seven, or nine.…For example, if I wanna match a whitespace character,…I can use this.…So the backslash followed by the lowercase s…will match anything that is whitespace.…This includes spaces, tabs, new lines,…form feeds, and vertical tabs.…The capital S matches anything…that is not whitespace, and there's a pattern here.…
In a lot of these classes, the capital version is negated.…So it's anything that is not.…So this is useful for finding words.…For example here, I'm just gonna…change this around a little bit…to say "my @a", so I'm making an array called "a",…equals, and I'm putting a slash g here so that it…gives us all the matches from a line…and take that out and instead,…say "foreach @a".…
So when I run this, getting anything that is not whitespace.…So it's basically giving me a list…of all of the individual letters in the string.…And if I put a plus sign here,…now it'll give me all of the non-whitespace grouped together…
Watch to learn the details of the Perl syntax, from variables, conditionals, loops, and data structures to regular expressions, functions, and references. A quick-start guide is included for experienced developers who want to get up and running with Perl 5 fast, and the entire course is recommended for both new and experienced programmers alike. Later chapters cover file handling and reusing code with Perl modules, plus Perl best coding practices.
- Understanding Perl's general syntax and the anatomy of a Perl script
- Writing statements and expressions
- Creating assignments
- Working with variables and strings
- Using data types effectively
- Defining logical flow with conditionals and loops
- Using special variables
- Using Perl operators
- Performing simple Perl programming tasks with expressions
- Matching data
- Defining and calling functions
- Using references
- Handling files in the file I/O
- Using built-in functions
- Reusing code with modules
- Coding with Perl best practices
Skill Level Intermediate
Foundations of Programming: Refactoring Codewith Simon Allardice1h 44m Intermediate
1. Setting Up
About Perl3m 36s
2. Quick Start
3. Basic Syntax
4. Values and Variables
7. Special Variables
9. Regular Expressions
11. References and Structures
12. File I/O
13. Built-In Functions
15. Best Practices
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