I would like to add space between the string by the regular expression the regular expression

I have this text(12test), I would like to add space between the string by the regular expression(Target sample:12 test)

string p="12test";

Regex rg = new Regex((@"(?i)(?<=^\d+)\s*(?=[\u4E00-\u9FFFa-z])"),
RegexOptions.Multiline | RegexOptions.Singleline);
p.Range.Replace(rg, " ");No successNo success

My Purpose is to add space between characters, you can use other methods to achieve.

I have resolvedv,To obtain the source string, as a replacement when editing charactersTo obtain the source string, as a replacement when editing characters

Hi,

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