RegexNest is a clean offline regular expression testing tool for developers, programmers and students.

TEST REGULAR EXPRESSIONS

Enter a regex pattern and sample text to instantly see matching results.

MATCH HIGHLIGHTING

RegexNest highlights matching text so you can quickly understand what your pattern finds.

MATCH DETAILS

View useful details for each match, including:

• Matched text
• Start and end positions
• Numbered capture groups

REGEX FLAGS

Control matching behaviour using:

• Case Sensitive
• Multiline
• Dot All

REPLACEMENT PREVIEW

Enter replacement text and preview the transformed output without changing your original sample text.

COPY RESULTS

Quickly copy:

• Regex patterns
• Individual matches
• All matches
• Replacement results

BUILT-IN EXAMPLES

Try useful offline examples for:

• Email-like text
• Numbers
• Capitalised words
• HEX colours
• Date formats

SAVE PATTERNS

Save useful regex patterns locally for later use.

You can:

• Save patterns
• Rename patterns
• Reuse patterns
• Delete patterns

RegexNest supports up to 30 saved patterns.

LIGHT AND DARK THEMES

Choose your preferred appearance:

• System
• Light
• Dark

OFFLINE AND PRIVATE

RegexNest works offline and does not require:

• An account
• Internet access
• Camera access
• Microphone access
• Location access

Your theme preference and explicitly saved regex patterns stay locally on your device.

RegexNest provides a focused and privacy-friendly way to test, inspect and understand regular expressions without unnecessary online services.