[Cpp-Programming] Re: Looping to get user input causes infinite loop

scanf("%[^\n]", expr);

Not familiar with using regex in scanf.  Perhaps it isn't clearing (flushing) the input buffer when you read a string in that way?  Try adding
fflush(stdin);
just before that line.

However, note that, apparently, this is technically not the correct way of doing it...

Welcome to the world of C++, where there's a 'gotcha' for everything you could ever want to do, and a solution that "usually works, unless you did this, except in the case where that happens, unless..."

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