Qtp select item using regex

[nivi]

I am studying qtp, I have a list field and I want select an item form that. For that I am using the following code and it's was generate using record option in qtp. now the system using Select "123" for selecting. Instead of 123 I want ^1\d\d

Actual code 

Code:

VbWindow("frmMDI").VbWindow("frmcheckIn").VbComboBox("cboRoomNo").Select "123"

I am tried the following code but it's not working

Code:

VbWindow("frmMDI").VbWindow("frmcheckIn").VbComboBox("cboRoomNo").Select ("^1\d\d")

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Thanks
nivi