単語から特殊文字を削除する

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])
}

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
}

hello
back-to-back

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