RE2 replaced PCRE(libpcre) ?

[ryan chou <jkryanchou () gmail com>]

Hi All,

   I wonder know could the PCRE regular expressions engine replaced with
the RE2 developed by Russ Cox(Google)? I have read the paper which
introduced the RE2's development and the benchmark between two Engine, And
the RE2's performance was better than PCRE's. (
https://swtch.com/~rsc/regexp/regexp3.html)

   So have any developer consider using RE2 replaced with libpcre to
improve the nmap performance on parsing fingerprint? and i also wonder know
why libpcre become the first choise for nmap services-fingerprint parsing?
why others like boost:regex and so on?

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