Best way to convert Pascal Case to a sentence

by 
public static string ToSentenceCase(this string str)
{
    return Regex.Replace(str, "[a-z][A-Z]", m => m.Value[0] + " " + char.ToLower(m.Value[1]));
}

In versions of visual studio after 2015, you can do

public static string ToSentenceCase(this string str)
{
    return Regex.Replace(str, "[a-z][A-Z]", m => $"{m.Value[0]} {char.ToLower(m.Value[1])}");
}

Based on: Converting Pascal case to sentences using regular expression

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