>>> "2007-10-30".replace("-", "/") # not replace all
"2007/10-30"
>>> "2007-10-30".replace(/-/g, "/")
"2007/10/30"
>>> "2007-10-30".replace("\d+", "*") # considered as string
"2007-10-30"
>>> "2007-10-30".replace(/\d+/g, "*")
"*-*-*"