Highlight Patterns in Text

Highlight matches using Regular Expressions (Regex).

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Ultra Fast

Changes apply in real-time. No server delays or page reloads.

Secure

Your text stays in your browser. Nothing is uploaded to our servers.

Regex Power

Leverage the full power of JavaScript Regular Expressions.

Try These Examples

Dates (YYYY-MM-DD)

Highlights all date patterns in ISO format like 2024-01-15.

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Email Addresses

Finds all email addresses in your text.

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URLs & Links

Matches HTTP and HTTPS URLs in your text.

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Phone Numbers

Finds US-style phone numbers like (555) 123-4567.

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Ultimate Guide: Highlight Patterns in Text with Regex

Regular Expressions (Regex) are a powerful tool for finding patterns in text. Our online regex highlighter allows you to visualize matches instantly, making it perfect for debugging, data analysis, and learning.

For Developers

Validate input formats like emails, phone numbers, or custom IDs. Use the "Show Source" view to copy the HTML with inline styles for your documentation or reports.

For Data Analysts

Quickly spot anomalies in logs or CSV files. Highlight dates, error codes, or specific keywords to visually scan large datasets without leaving your browser.

Pro Tip: Regex Flags

By default, our tool uses the g (global) flag to find all matches. Toggle "Case Sensitive" to remove the i (case-insensitive) flag. This gives you precise control over your search pattern.