This is a really cool #regex #expression #matcher #implementation in just 30 lines of C #code https://www.cs.princeton.edu/courses/arc.. Hats off to #robpike and #briankernigham !
Very cool #hack to use #regex to #test whether a #number is #prime or not: https://www.noulakaz.net/2007/03/18/a-re.. As I understand it, it #tests the #numbers of #ones in the #string.