I am trying to check the username whether is only containing alphabetic characters. What is the idiomatic way to check it in Go?
4条回答 默认 最新
- dongpangbu4016 2016-07-24 16:55关注
you may use
unicode.IsLetter
like this working sample code:package main import "fmt" import "unicode" func IsLetter(s string) bool { for _, r := range s { if !unicode.IsLetter(r) { return false } } return true } func main() { fmt.Println(IsLetter("Alex")) // true fmt.Println(IsLetter("123")) // false }
or if you have limited range e.g. 'a'..'z' and 'A'..'Z', you may use this working sample code:
package main import "fmt" func IsLetter(s string) bool { for _, r := range s { if (r < 'a' || r > 'z') && (r < 'A' || r > 'Z') { return false } } return true } func main() { fmt.Println(IsLetter("Alex")) // true fmt.Println(IsLetter("123 a")) // false }
or if you have limited range e.g. 'a'..'z' and 'A'..'Z', you may use this working sample code:
package main import "fmt" import "regexp" var IsLetter = regexp.MustCompile(`^[a-zA-Z]+$`).MatchString func main() { fmt.Println(IsLetter("Alex")) // true fmt.Println(IsLetter("u123")) // false }
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