gistfile1.js

#!/usr/bin/env node

r = new RegExp("^(\w+)\s+")

str = "abc 123"
console.log("testing new RegExp(...) [non-compiled]")
start = Date.now()
for(i = 0; i < 10000000; ++i) {
  str.match(r)
}
end=Date.now()
console.log("..."+(end-start)+"ms")

console.log("testing new RegExp(...) [compiled]")
r.compile()
start = Date.now()
for(i = 0; i < 10000000; ++i) {
  str.match(r)
}
end=Date.now()
console.log("..."+(end-start)+"ms")

console.log("testing str.match(/.../)")
start = Date.now()
for(i = 0; i < 10000000; ++i) {
  str.match(/^(\w+)\s+/)
}
end=Date.now()
console.log("..."+(end-start)+"ms")