Introduction to Regular Expressions in Javascript | CodeSignal Learn

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Introduction to Regular Expressions in Javascript

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4 courses

63 practices

4 hours

Learn to tame text with regular expressions in JavaScript. From simple matches to capture groups, validation, Unicode, performance, and real-world ETL, you’ll build practical regex skills for cleaner, faster data processing.

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Verified skills you'll gain

INTERMEDIATE

Computer Science Fundamentals

INTERMEDIATE

Software Development Practices

Tools you'll use

JavaScript

Course 1

Regex Foundations in JavaScript: Matching Patterns

4 lessons

17 practices

You'll start your journey into regular expressions by learning the core concepts. You will write patterns to find text, use special characters to define rules, and learn how to match specific parts of a string. This course builds the essential foundation for all your future text-processing tasks in JavaScript.

Course 2

Extracting Data with Capture Groups in JavaScript

4 lessons

15 practices

Go beyond simple matching and learn to pull specific data out of text. You'll use capture groups to parse structured information, find repeated patterns, and perform powerful text transformations. This course will equip you to clean, reformat, and extract valuable data from any string with precision.

Course 3

Regex Validation, Flags, and Text Processing in JavaScript

4 lessons

16 practices

Move into advanced regex techniques for robust data processing. You'll write patterns to validate user input, control matching with flags for readability and power, and use lookaheads for complex conditional logic. Finally, you'll learn to process large text files efficiently, a key skill for real-world data.

Course 4

Real-World Regex in JavaScript: Performance and Integration

4 lessons

15 practices

Put all your skills together to build production-ready regex. You'll learn to write fast, efficient patterns, handle international text, and create maintainable code. The course culminates in a capstone project where you build a complete data processing pipeline from scratch, just like a professional.

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