Regex Builder - Free Online Tool | PivaBox

Build regular expressions visually using checkboxes and selection controls

How to Use Regex Builder

1. Select anchors if needed (start ^ / end $), and choose character classes like \d, \w, \s
2. Add quantifiers for repetition patterns and select flags like g (global) and i (case-insensitive)
3. The regex pattern updates in real time. Copy the final expression for use in your code

Frequently Asked Questions

Is Regex Builder free?

Yes, PivaBox Regex Builder is completely free to use. All processing is done in your browser.

Are my patterns uploaded to a server?

No. All regex generation is done locally in your browser. Your patterns never leave your device.

What regex features does the builder support?

The builder supports anchors (start of string ^, end of string $), character classes (\d digits, \w word chars, \s whitespace, . any), quantifiers (+, *, ?, zero-or-one, specific count), and flags like g (global), i (case-insensitive), m (multiline), and s (dotall). Additional customization can be typed manually.