正则表达式将字符串解析为环境变量

Question

I have a string that I am trying parse using go regexp and convert to os.Getenv(env). Assuming we have string "hello world -p $PATH -f $HOSTNAME " in Go, and want to use regexp to read os.Getenv("PATH") and os.Getenv("HOSTNAME"). Anyone can help me with a proper regexp parser that will extract out "$" along with the word pass it through the os.Getenv() as the parameter for getting the environment variable?

Answer 1

The os.ExpandEnv function replaces $var or ${var} in a string according to the values in the environment. I recommend using this function instead of writing your own using regular expressions.