I’m looking for a general regex construct to match everything in pattern x EXCEPT matches to pattern y. This is hard to explain both completely and concisely…see Material Nonimplication for a formal definition. For example, match any word character (\w) EXCEPT ‘p’. Note I’m subtracting a small set (the letter ‘p’) from a larger set … Read more
According to the C++ Standard 1 The && operator groups left-to-right. The operands are both contextually converted to bool (Clause 4). The result is true if both operands are true and false otherwise. Unlike &, && guarantees left-to-right evaluation: the second operand is not evaluated if the first operand is false. and 1 The || operator groups left-to-right. … Read more
What you’ve written actually almost works (it would work if all the variables were numbers), but it’s not an idiomatic way at all. (…) parentheses indicate a subshell. What’s inside them isn’t an expression like in many other languages. It’s a list of commands (just like outside parentheses). These commands are executed in a separate subprocess, so … Read more
The single ampersand & is the logical AND operator. The double ampersand && is again a logical AND operator that employs short-circuiting behaviour. Short-circuiting just means the second operand (right hand side) is evaluated only when the result is not fully determined by the first operand (left hand side) A & B (A and B … Read more
You would want and instead of &&.
The != operator serves this purpose for bool values.
If you’re already normalizing the inputs to booleans, then != is xor.
If you’re already normalizing the inputs to booleans, then != is xor.
You would want and instead of &&.