Interesting. That's very subtle behavior. (Especially since it sometimes fools one into thinking /g option is not enabled when in reality, it's a CR+LF issue.

Interesting. That's very subtle behavior. (Especially since it sometimes fools one into thinking /g option is not enabled when in reality, it's a CR+LF issue.) I'm not saying your site's interpretation of Windows CR+LF is "wrong" but the other 5 online[1] regex testers don't behave that way on Windows Chrome browser. I also tested the regex and target text on desktop JGSoft RegexBuddy[2]. None of those required "\s\s" instead of "\s". Debuggex at the least, is very idiosyncratic since the majority of the other testers don't treat CR+LF that way. [1]regex testers tried with "([A-Z])\w+\s\w(\d.\d)" on Windows: http://regexr.com/3b22q http://regexr.com/3b22q http://regviz.org/ http://regviz.org/ http://www.rexv.org/ http://www.rexv.org/ https://regex101.com/r/eB5jY1/1 https://regex101.com/r/eB5jY1/1 https://www.debuggex.com/r/mci3WLNmHGTEatf6 https://www.debuggex.com/r/mci3WLNmHGTEatf6 [2]http://i.imgur.com/t2L04mO.png http://i.imgur.com/t2L04mO.png (http://www.regexbuddy.com/ http://www.regexbuddy.com/)