Free Online Regex Tester & Debugger

Q: What flags are supported in the Regex Tester?

You can toggle global (g), case-insensitive (i), multiline (m), and dotAll (s) regex flags.

Q: Are all developer tools 100% free to use?

Yes! All developer tools on AllInOneWebToolz.com are completely free with zero file limits or mandatory account registration.

Q: Is my source code or JSON data uploaded to external servers?

No. All code formatting, minification, regex testing, and encoding occur 100% locally within your browser context. Your code never leaves your computer.

Q: What developer utilities are supported in this suite?

We provide JSON Formatter & Validator, CSS & JS Minifier, UUID Generator, Unix Timestamp Converter, Regex Tester & Debugger, Base64 Encoder/Decoder, URL Encoder/Decoder, and Color Palette & Picker.

Evaluate regular expressions in real-time, test pattern matching, inspect match counts, and explore regex modifier flags.

JSON Formatter CSS & JS Minifier Unique ID Generator Timestamp Converter Regex Tester Base64 Tool URL Encoder Color Palette Hash Generator Chmod Calculator Open Graph Generator IP Lookup

Presets:

Regular Expression Pattern Input:

/ /gi

Regex Modifiers / Flags Context: Toggle flags to update pattern `/pattern/flags` dynamically

g - Global Find all matches across entire text instead of stopping after first match.

i - Ignore Case Case-insensitive matching (uppercase and lowercase letters match).

m - Multiline Anchors ^ and $ match the start and end of each individual line (\n).

s - Single Line / Dot All Dot wildcard character (.) matches any character including line breaks (\n).

Test String Text: 0 matches

Visual Match Highlights Output:

Frequently Asked Questions

What flags are supported in the Regex Tester?

Are all developer tools 100% free to use?

Is my source code or JSON data uploaded to external servers?

What developer utilities are supported in this suite?