Regex Builder

Regex Builder is a tool that lets you visually construct complex regular expressions. Regular expressions are essential in programming and text processing, but memorizing the syntax can be challenging.

With this tool, you can build regex patterns simply by clicking parts such as character classes (\d, \w, \s), quantifiers (*, +, ?), anchors (^, $, \b), groups (capturing, non-capturing, lookahead), and negated classes ([^a-z] etc.).

Over 12 preset patterns are available for email addresses, URLs, phone numbers, postal codes, IP addresses, dates, UUIDs, credit cards, URL slugs, hex colors, Markdown headings, and HTML tags—each insertable with one click.

The constructed regular expression is tested against your sample text in real time, with matching portions highlighted. Toggle flags (g, i, m, s) to adjust matching behavior. The finished regex can be easily copied to clipboard.

A built-in text escaping tool converts plain text into safely escaped regex patterns, making it easy to handle special characters. All processing is done entirely in your browser, and no input data is ever sent to a server.