searching for a string value in registry using VBS

[sfarooq70]

I am looking for a VBS script which searches for a particular string in a regsitry (REG_SZ) key. If the String does not exist the script should append some additional string value.

This is the Regsitry key i wish to search.

HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyOverride

Any assistance would be greatly appreciated.