A regular expression (regex, regexp or rational expression) is a sequence of characters that specifies a search pattern. Usually these patterns are used by string-searching algorithms for find or find and replace operations on strings, or for input validation.

Unlike most Regex builders you'll find online, ours gives you an unlimited number of modifiers and string entries. It is built for quickly creating a set of string modifiers with customizable delimiters and assertion statements. The result is a simple declarative regex that you can copy and use on your text corpus. You can also copy and customize this regex builder with Retool to generate the perfect app for your workflow.

Yes, it is.

This RegEx generator is powered by a Retool app using an embedded app, which allows you to easily turn internal tools and apps like this generator into public, customer-facing apps. See our other apps, like our CSV to JSON tool, LLM API tool, JSON to CSV tool, and our RegEx tester