How to remove duplicated spaces from a string without removing new lines characters

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I can read here: How to remove redundant spaces/whitespace from a string in Golang? that I can use regex or strings.Fields to remove duplicated spaces from strings.

I need to know a fast (performances matter here) way to remove ONLY duplicated (or more) spaces from a (maybe long) string and NOT remove new lines characters like \n.

Example:

  1. "I have[SPACE][SPACE][SPACE]duplicated spaces[SPACE][SPACE][SPACE]as you can see" => "I have[SPACE]duplicated spaces[SPACE]as you can see"

  2. "I have[SPACE][SPACE][SPACE]new lines\n\ntoo" => "I have[SPACE]new lines\n\ntoo"

go string
1 Answers
strings.ReplaceAll(strings.Join(strings.FieldsFunc(text, func(r rune) bool {
    if r == '\n' {
        return false
    }
    return unicode.IsSpace(r)
} ), " ")," \n", "\n")

r := regexp.MustCompile("( ){2,}")
r.ReplaceAllString(input, " ")

strings.FieldsFunc seems to be a lot faster than regexp

cpu: Intel(R) Core(TM) i5-1038NG7 CPU @ 2.00GHz
BenchmarkRegexp
BenchmarkRegexp-8         841189          1299 ns/op
BenchmarkFields
BenchmarkFields-8        3375925           355.4 ns/op
user_100986510
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