Learn how to control the behavior of regexes with modifiers.
- [Voiceover] Modifiers are used to modify…the default behavior of the regex parser.…Here's a working copy of match.pl…from chapter nine of the exercise files,…and, you notice if I just run this, I get true,…because this match is true.…However if I change this to use capital letters…and I run it again, you see now it says false,…because that no longer matches.…I can modify this regular expression to match…ignoring case, so it will match upper case, lower case,…mixed case, anything, and if I save this and run it,…now it's true again, because it's matching…without regard to case.…
So, we return this to its previous state…and we're going to now look at the /g modifier,…which is the global modifier.…In order to understand this, I'm gonna use…a regular expression on list context.…So I'm gonna say foreach,…and that makes it a list context.…$s slash i, just the letter i,…like that, and that'll list…every instance of i in the match.…
and when I run this, you notice that it only gives us one.…It actually gives us the number one…
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
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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