As a ruby developer, I was happy to find that VS Code / TextMate grammar files use the same regular expression engine called Oniguruma as ruby itself. Thus, I could be sure that when trying my regular expressions in my favorite online regex tool, rubular.com, there would be no inconsistencies due to the engine inner workings. - Source: dev.to / 7 months ago

In my testing on a couple of regex testers (https://rubular.com/ & https://regex101.com/) this seems to select the postcode correctly each time. Source: 12 months ago

Copied from Rubular ( a nice tool to test regexes ):. Source: over 1 year ago

To add on to this from a regex perspective - I find regex to be invaluable in my workflows. Once you learn the basics I always test and debug my strings using https://rubular.com because it has string hints at the bottom that are readily available. Source: over 1 year ago

Mostly trial and error using pythex.org for python, regextester.com for c/c++, or rubular.com if you're coding in ruby for some reason. Source: over 1 year ago

Https://haveibeenzuckered.com/ is good, but only works with phone numbers. It will tell you if a number has been associated in the breach. If someone tagged the phone number on their profile (business pages will have these), you can do an operator search in Google to potentially find the account. Did it the other day and worked like a charm. Source: about 1 year ago

If any of you are wondering - https://haveibeenzuckered.com/. Source: about 3 years ago