Go言語でキャメルケースをスネークケースに変換する - Qiita

import "strings" func CamelToSnake(s string) string { if s == "" { return s } delimiter := "_" sLen := len(s) var snake string for i, current := range s { if i > 0 && i+1 < sLen { if current >= 'A' && current <= 'Z' { next := s[i+1] prev := s[i-1] if (next >= 'a' && next <= 'z') || (prev >= 'a' && prev <= 'z') { snake += delimiter } } } snake += string(current) } snake = strings.ToLower(snake) ret