Remove special characters from words

Question content

I am writing a function in go to clean individual words, thereby removing special characters at the beginning and end of each word.

Right now:

• .-Hello,->Hello
• "Back to Back"->Back to Back

I get the following result by checking each end letter by letter to see if it belongs to the unicode.letter set, which works great, but I'm wondering if there is a better or more efficient way to do this? I tried strings.trimleft/right, but then I had to define my own set of characters to remove. It would be nice to use predefined collections.

func TrimWord(word []rune) string {
    var prefix int = 0
    var suffix int = len(word)

    for x := 0; x < len(word); x++ {
        if !unicode.IsLetter(word[x]) {
            prefix++
        } else {
            break
        }
    }

    for x := len(word) - 1; x >= 0; x-- {
        if suffix == prefix {
            break
        }
        if !unicode.IsLetter(word[x]) {
            suffix--
        } else {
            break
        }
    }
    return string(word[prefix:suffix])
}

Correct answer

package main

import (
    "fmt"
    "strings"
    "unicode"
)

func trimword(s string) string {
    return strings.trimfunc(s, func(r rune) bool {
        return !unicode.isletter(r)
    })
}

func main() {
    fmt.println(trimword(`.-hello,`))       // -> hello
    fmt.println(trimword(`"back-to-back"`)) // -> back-to-back
}

https://www.php.cn/link/55053683268957697aa39fba6f231c68

hello
back-to-back

Package string

func TrimFunc(s string, f func(rune) bool) string

trimfunc returns a slice of string s with all leading and trailing unicode code points c removed that satisfy f(c).

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