regex

Standard

http://regexvisualizer.apphb.com/

http://www.regular-expressions.info/reference.html

http://en.wikipedia.org/wiki/Regular_language

http://en.wikipedia.org/wiki/Regular_grammar

http://en.wikipedia.org/wiki/Regular_expression

http://en.wikipedia.org/wiki/Chomsky_hierarchy

 

regex to check prime

http://www.noulakaz.net/weblog/2007/03/18/a-regular-expression-to-check-for-prime-numbers/

http://qntm.org/greenery

http://www.cis.upenn.edu/~cis639/docs/fssyntax.html

http://www.dreambank.net/regex.html

 

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