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Re:Regexper – Regular expressions visualizer by kenborge on Tuesday January 30, 2018 @11:07AM (#16266356)
Does not look like it supports negative lookbehind https://regexper.com/#(%3F%3C!a)b
Re:Regexper – Regular expressions visualizer by onion2k on Tuesday January 30, 2018 @11:37AM (#16266647)
It does do negative lookahead though - https://regexper.com/#%2F%5Cd%2B(%3F!%5C.)%2F

Negative lookbehind only appeared in Chrome in v.62 (https://v8project.blogspot.co.uk/2017/09/v8-release-62.html) it's not too surprising that tools haven't caught up yet.

Re:Regexper – Regular expressions visualizer by barryoneill on Tuesday January 30, 2018 @11:16AM (#16266447)
I'm sure they'd appreciate a ticket - There's already this which is similar: https://github.com/javallone/regexper-static/issues/26