Learn how to replace text using regular expressions.
- [Voiceover] Regular expressions are also commonly used…to search and replace text…in strings.…Here's a working copy of replace.pl from Chapter 9…of the exercise files.…And this is a simple replacement,…we search for…the word line…and replace it with the word string,…and when I run this you'll see it says…This is a string of text…instead of "This is a line of text".…Now if I wanted to replace…every occurrence of the letter s or the letter e…with the letter x,…I would simply do this.…
And when I build and run this,…you notice that it replaces just the first occurrence,…not all of them…because I need to put in the g here…to make this search and replace global.…And now,…my result is…has x's in place of all of the s's and e's,…and that extra one there is of course the x…that was already in the string…that did not need to get replaced.…And so you can see that…with literal strings,…and with classes of strings,…this is actually really, really easy.…You can also extract and reuse…parts of the original string in the replacement.…
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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