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JAVASCRIPT Snippets.

Extract Root Domain from a URL

Extract the core domain name (e.g., example.com) from a full URL string, ignoring scheme, www subdomain, path, and query parameters.

Extract Content within Parentheses

Extract all substrings enclosed within balanced parentheses `()` from a given text, useful for parsing specific data blocks.

Convert Newlines to HTML <br> Tags

Automatically replace all newline characters (`\n`, `\r\n`) in a string with HTML `<br>` tags for web display.

Validate String for Alphanumeric Characters (and optional spaces/hyphens)

Verify if a string contains only letters, numbers, spaces, and hyphens, commonly used for validating usernames or simple text inputs.

Validate Semantic Versioning (SemVer)

Essential regex to accurately validate semantic version numbers (e.g., 1.2.3, 1.0.0-alpha.1) for consistent version management in web projects.

Extract All Links (`href`) from HTML Anchor Tags

Discover how to efficiently extract all URL links from `<a>` tags within an HTML string using a simple yet powerful regular expression in JavaScript.

Validate CSS Hex Color Codes

Quickly validate common CSS hexadecimal color formats (e.g., #FFF, #FFFFFF, FFF, FFFFFF) with a concise regular expression for UI development.

Remove C-style Multi-line Comments

Learn to strip multi-line `/* ... */` comments from code or configuration files using a regular expression, useful for minification or processing.

Normalize Multiple Newlines to Single

Clean up text content by replacing multiple consecutive newline characters with a single newline, improving readability and data consistency.

Extract All Numbers (Integers & Decimals) from a String

Learn how to use regular expressions in JavaScript to efficiently extract all numeric values, including integers and floating-point numbers, from any given string for data processing.

Normalize Whitespace: Replace Multiple Spaces with Single

Discover how to clean up text strings in JavaScript by using a regex to replace any sequence of multiple whitespace characters (spaces, tabs, newlines) with a single space.

Mask Sensitive Data (e.g., Credit Card Numbers) for Display

Learn to securely mask sensitive information like credit card numbers in a string using regular expressions, displaying only the last few digits for privacy and security.