Implementing Regular Expressions by Russ Cox
http://swtch.com/~rsc/regexp/
A Regular Expression Matcher, Code by Rob Pike, Exegesis by Brian Kernighan
http://genius.cat-v.org/brian-kernighan/articles/beautiful
Knuth-Morris-Pratt string matching algorithm
http://www.ics.uci.edu/~eppstein/161/960227.html
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