Grammarly - Clear, effective, mistake-free writing everywhere you type.

rubular - A ruby based regular expression editor

ProWritingAid - For the smarter writer. A grammar checker, style editor, and writing mentor in one package.

RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.

Gramara - AI grammar correction with transformers

RegEx Generator - RegEx Generator is a simple-to-use application that comes with the brilliance of intuitive regex and is also helping you out to test the regex.