Instr with RegEx - Runtime error 5017 (RegEx Code provided)

Hello,

I found the following Instr function with RegEx.

The code Always stuck at 'set found = regEx.Execute(SearchIn).

Can anyone help me what's wrong with it?

Note that I've also checked the Microsoft VBScript Regular Expressions (1.0 or 5.5) and still is giving the same error.

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NOTE: Was able to resolve by using "\\([0-9]+) ([0-9]+)\\" instead of "\## ####\"

Hello
Can you give more details?
How did you use the UDF? Upload sample for better explanation

I think I realized the problem. The problem is because I have the "\". So if I want the "\" included in the search, how do I go about doing it?