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coredns/plugin/auto/regexp.go

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package auto
// rewriteToExpand rewrites our template string to one that we can give to regexp.ExpandString. This basically
// involves prefixing any '{' with a '$'.
func rewriteToExpand(s string) string {
// Pretty dumb at the moment, every { will get a $ prefixed.
// Also wasteful as we build the string with +=. This is OKish
// as we do this during config parsing.
copy := ""
for _, c := range s {
if c == '{' {
copy += "$"
}
copy += string(c)
}
return copy
}