How to trim leading and trailing white spaces of a

问题:

Which is the effective way to trim the leading and trailing white spaces of string variable in Go?

回答1:

For example,

package main

import (
    "fmt"
    "strings"
)

func main() {
    s := "\t Hello, World\n "
    fmt.Printf("%d %q\n", len(s), s)
    t := strings.TrimSpace(s)
    fmt.Printf("%d %q\n", len(t), t)
}

Output:

16 "\t Hello, World\n "
12 "Hello, World"

回答2:

There's a bunch of functions to trim strings in go.

See them there : Trim

Here's an example, adapted from the documentation, removing leading and trailing white spaces :

fmt.Printf("[%q]", strings.Trim(" Achtung  ", " "))

回答3:

package main

import (
    "fmt"
    "strings"
)

func main() {
    fmt.Println(strings.TrimSpace(" \t\n Hello, Gophers \n\t\r\n"))
}

Output: Hello, Gophers

And simply follow this link - https://golang.org/pkg/strings/#TrimSpace

回答4:

For trimming your string, Go's "strings" package have TrimSpace(), Trim() function that trims leading and trailing spaces.

Check the documentation for more information.

回答5:

Just as @Kabeer has mentioned, you can use TrimSpace and here is an example from golang documentation:

package main

import (
    "fmt"
    "strings"
)

func main() {
    fmt.Println(strings.TrimSpace(" \t\n Hello, Gophers \n\t\r\n"))
}

回答6:

@peterSO has correct answer. I am adding more examples here:

package main

import (
    "fmt"
    strings "strings"
)

func main() { 
    test := "\t pdftk 2.0.2  \n"
    result := strings.TrimSpace(test)
    fmt.Printf("Length of %q is %d\n", test, len(test))
    fmt.Printf("Length of %q is %d\n\n", result, len(result))

    test = "\n\r pdftk 2.0.2 \n\r"
    result = strings.TrimSpace(test)
    fmt.Printf("Length of %q is %d\n", test, len(test))
    fmt.Printf("Length of %q is %d\n\n", result, len(result))

    test = "\n\r\n\r pdftk 2.0.2 \n\r\n\r"
    result = strings.TrimSpace(test)
    fmt.Printf("Length of %q is %d\n", test, len(test))
    fmt.Printf("Length of %q is %d\n\n", result, len(result))

    test = "\r pdftk 2.0.2 \r"
    result = strings.TrimSpace(test)
    fmt.Printf("Length of %q is %d\n", test, len(test))
    fmt.Printf("Length of %q is %d\n\n", result, len(result))   
}

You can find this in Go lang playground too.