regex101

Build and test regular expressions

FreeFree online tools

About regex101

regex101 is a regex tester. See each match explained as you type, for several languages.

regex101 is best for developers who are writing or debugging a pattern. regex101 is free to use. It works on the web.

What is regex101?

regex101 is a regex tester. See each match explained as you type, for several languages.

Who is regex101 best for?

regex101 is best for developers who are writing or debugging a pattern.

What are the main features of regex101?

Its main features include Live explanation, Several flavours and Saved patterns.

Is regex101 free?

Yes. regex101 is free to use. Check its website in case that changes.

What platforms does regex101 work on?

regex101 works on the web.

How do I choose a regex tester?

Check that it supports your language’s regex flavour, and how well it explains a match.