https://www.debuggex.com/ https://www.debuggex.com/ is a neat one for showing a syntax chart (or railroad chart) visualization. I generally use https://regex1

https://www.debuggex.com/ https://www.debuggex.com/ is a neat one for showing a syntax chart (or railroad chart) visualization. I generally use https://regex101.com https://regex101.com for its display of matched groups (when I'm dealing with complex groups and/or replacement backreferences), and http://regexstorm.net/tester http://regexstorm.net/tester when I specifically need to check a regex that will be running in .NET or Powershell.