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I see, thanks! I suppose since the regex checks for https://twitter.com it won't match with https://fxtwitter.com. I tried to avoid making use of the https:// to account for e.g. www.twitter.com or twitter.com, but that's for later me to figure out :)
regex101 is perfect for testing but regexr seems to be more helpful with the learning curve. You might want to check that one too when you decide to give it another go.