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Regular Expressions: A Practical JavaScript Guide

Master regular expressions in JavaScript. Learn patterns, flags, and practical examples for text processing.

B
Bootspring Team
Engineering
February 27, 2026
3 min read

Regular expressions are powerful for text matching and manipulation. This guide covers practical patterns for common tasks.

Basic Syntax

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Common Patterns

Email Validation

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URL Validation

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Phone Numbers

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Password Validation

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Capturing Groups

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String Methods

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Replace with Functions

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Lookahead and Lookbehind

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Practical Examples

Extract All URLs

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Sanitize Input

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Parse CSV Line

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Highlight Search Terms

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Performance Tips

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Regular expressions are powerful but can be hard to read. Add comments for complex patterns and consider named groups for clarity.

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