node.jsのregexpの検証

regexptest.coffee

# http://developer.cybozu.co.jp/tech/?p=8757
{sprintf} = require 'sprintf-js'
pattern = /(\w|_){1,64}@/
#pattern = /(\w){1,64}@/

for i in [1..64]
  target = [1..i].reduce ((p, n)-> p + '_'), ''
  start = process.hrtime()
  pattern.exec(target)
  elapsed = process.hrtime(start)
  console.log sprintf "%d,%d.%06d sec", i, elapsed[0], elapsed[1]
  

http://developer.cybozu.co.jp/tech/?p=8757 の件、node.jsでも再現した。