Escaping a '.' in extraParams

How can I escape a ‘.’ in the extraParams value?
In extraParams in livetable - #3 by rblomme I found out to use a ‘\\’ like in this example:

'extraParams': '&fieldName=XYZ\\.123 SomeName'

But the items with XYZ.123 SomeName are not shown in the resulting liveTable. How can I improve my code?