More from Donald Knuth
I define UNIX as 30 definitions of regular expressions living under one roof.
Digital Typography, ch. 33, p. 649 (1999)Beware of bugs in the above code; I have only proved it correct, not tried it.
Closing line of a memo, “Notes on the van Emde Boas construction of priority deques: An instructive use of recursion” (1977)- The Art of Computer Programming (1968–2011), Vol. II, Seminumerical Algorithms, Section 3.3.2 part B, first paragraph (1969)


