Power query parameter to select result

Hi, in excel, which I've included, I have a formula to pick out the alphabet, numbers or sprcial characters from a string.
and the reusult is determined by switch looking to a drop down list,

I have tried to create this so ;

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but the last part following the in I do not want hard coded I have created a paramer of the options, but this does not work when plugged into
text.combine, I have attached all this. I think the problem is that it sees the value from the parameter as "text", not referring to the variable,


I have tried putting it withing the let so simplified ;

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but this does not work either? help?

Richard.

You could just do something like this:

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You could also do something like this:

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