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Unexpected different behaviour when using parentheses in C# regex
System.Text.RegularExpressions.Regex separatorRegex1
= new System.Text.RegularExpressions.Regex("a");
System.Text.RegularExpressions.Regex separatorRegex2
= new System.Text.RegularExpressions.Regex("(a)");
string str = "a";
string[] split1 = separatorRegex1.Split(str); // { "", "" }
string[] split2 = separatorRegex2.Split(str); // { "", "a", "" }
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