Join Bill Weinman for an in-depth discussion in this video Simple matches, part of Perl 5 Essential Training.
- [Voiceover] In its simplest form, a regular expression…is used to match characters in a string.…If I come in here and just put an i…in my regular expression, this matches the single letter i,…and if I run this, of course it's True…because there is an i.…There's actually several i's in my string.…On the other hand, if I use a caret here at the beginning,…this'll match an i only if it's at…the beginning of the string.…We can see that there is no i at the beginning of the string…and so this evaluates to False.…
On the other hand, if I change this to a T,…now when I run it, I get True…because there is a T at the beginning of the string.…Or I can make this at the end of the string…with the $, and this'll anchor that irregular expression…to the end of the string, the end of the line.…Of course, if I run this it says False…because there is no T at the end of the line.…If I make this a t, now it will evaluate True.…
You can also do slightly more complex matches,…For instance, if I wanted to get three a's in a row,…I can do that like that with a 3, a number 3 in curly braces…
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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