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MAP operator not capturing from RegEx
I have a collection of attributes that have values like 1 ~ 5, 5 ~ 20, and so on, and I would like to use the Map operator to map those values into something of the type 1 - 5, 5 - 20. Thus, I would like to replace the ~ symbol by the - symbol.
Anyway, like I said, I am using the Map operator to do so and, having selected my attribute, I introduce a regular expression in the parameter Replace what and "$1 - $2" in the parameter Replace by. That should work, as far as I am concerned, but I don't obtain the expected expression but just a Text field saying "$1 - $2" literally.
What am I doing wrong? I would appretiate some help.