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This site is pure awesome: https://regex101.com/
Regexp testing, validation and on-the-fly editor. Makes regexp actually not painful.
@jaywink Using it every day, it can't say how much I love this website!
@jaywink I spent a fair bit of time in https://regexcrossword.com/ the other day. Not quite the same but... :P
@jaywink True, using it a lot. It's the best around.