go/src/internal/stringslite/strings.go

func HasPrefix(s, prefix string) bool { … }

func HasSuffix(s, suffix string) bool { … }

func IndexByte(s string, c byte) int { … }

func Index(s, substr string) int { … }

func Cut(s, sep string) (before, after string, found bool) { … }

func CutPrefix(s, prefix string) (after string, found bool) { … }

func CutSuffix(s, suffix string) (before string, found bool) { … }

func TrimPrefix(s, prefix string) string { … }

func TrimSuffix(s, suffix string) string { … }

func Clone(s string) string { … }