golang + mongodb：清理输入

Question

I would like to verify the users' input before inserting it into the database. With this trim function, I can check whether the input was empty was empty or not.

if len(strings.Trim(r.Form.Get("firstName"), " ")) == 0 {

But I would like also to detect messages like these:

"username": {"$ne": null}

I tried stuff like if len(strings.Trim(r.Form.Get("firstName"), " $/^\")) == 0 {, but always get errors concerning the signs. What am I doing wrong?

Answer 1

You need to escape the backslash in order to get rid of error.

package main

import (
    "fmt"
    "strings"
)

func main() {
    firstName := " ^$/  Hans \\ ^$  "
    sanitizedName := strings.Trim(firstName, " $/^\\")
    fmt.Println(sanitizedName)
}

Output:

Hans