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What is the \? string escape sequence in D?
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In particular, the \n escape sequence represents the newline character. A \n in a printf format string tells awk to start printing output at the beginning of a newline.
Character combinations consisting of a backslash (\) followed by a letter or by a combination of digits are called "escape sequences." To represent a newline character, single quotation mark, or certain other characters in a character constant, you must use escape sequences.
An escape sequence is a sequence of characters that does not represent itself when used inside a character or string literal, but is translated into another character or a sequence of characters that may be difficult or impossible to represent directly.
It's just to escape ?, a literal question mark.
There really is no reason for it to be in D, but it existed in C and C++ in order to avoid the question mark being interpreted as a Trigraph. D doesn't have Trigraphs, so its inclusion must simply be for some added backwards compatibility with C and C++.
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