RegExr: A website for interactive regex prototyping with syntax highlighting

Unfortunately, RegExr does not color-code the different capturing groups. For example, replace the RegExr sample regex with "([A-Z])\w+\s\w(\d.\d)" and compare[1][2] its color coding capability to the other regex helpers. The other sites such as regex101.com & debuggex.com will delineate the capture groups within the matched text using different colors. This is very helpful for complex captures because making the boundaries visible can reveal bugs in your thinking of what substrings the regex is actually…

My favorite is https://regex101.com/ But I've found all of the following to be useful: http://regexone.com/ http://www.regexpal.com/ http://www.rexegg.com/ http://regexr.com/ https://www.debuggex.com/ https://regexper.com/ https://www.regular-expressions.info/ http://www.cheatography.com/davechild/cheat-sheets/regular-e... http://eloquentjavascript.net/09_regexp.html http://www.smashingmagazine.com/2009/06/essential-guide-to-r... http://www.smashingmagazine.com/2009/05/introduction-to-adva…

I (and most people I talk to about this stuff) tend to use Regex101 (https://regex101.com) for this purpose. It will be interesting to spend some time with RegExr and compare the two tools. I am also aware of RegexBuddy (https://www.regular-expressions.info/regexbuddy.html), whose author also publishes very good regex learning content on their site. It looks great, but it's a closed-source Windows-only application, which means it's something I'll never be able to benefit from.

For those not aware of all the alternative online regex testers out there... I prefer regex101.com because of the better color coding. I previously made a snippet demonstrating that benefit: https://news.ycombinator.com/item?id=9581225