true if and only if the specified string matches the beginning of Key1 or it's part Key2 or it's part. Start of partial key is encoded by uppercase letter.
Remarks
The comparison is case-insensitive.
Example
If (Key1 == "noRth") || (Key2 == "South") then match("NOR") == true and match("SOUTHWEST") == false; match("RT") == true and match("UT") == false.