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4. Russ Cox. 2007. Regular Expression Matching Can Be Simple And Fast (but is slow in Java Perl PHP Python Ruby ...). https://swtch.com/~rsc/regexp/regexp1.html Russ Cox. 2007. Regular Expression Matching Can Be Simple And Fast (but is slow in Java Perl PHP Python Ruby ...). https://swtch.com/~rsc/regexp/regexp1.html