RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
TheRightMargin - TheRightMargin is a smart writing tool.
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Just Not Sorry - Highlight 'weak' words so you can edit them out
rubular - A ruby based regular expression editor
Automator for Figma - Automator is a plugin or Figma that lets you create custom drag and drop automations that do time-sensitive Figma tasks for you in one click.