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The building blocks are:

{ =or(expression1,expression2) }

returns 1 if either expression1 or expression2 or both expressions are 1, 0
otherwise

within an = field, or functions can be nested

{ =or(expression1,or(expression2,expression3)) }

When you need to do a comparison, you can use

{ IF "{ MERGEFIELD doc_param }" = "ap.*" "1" "0" }

so then you can do

{ =or( IF "{ MERGEFIELD doc_param }" = "ap.*" "1" "0" },expression2)  }

or you can use

{ COMPARE "{ MERGEFIELD doc_param }" = "ap.*" }

which returns 1 for "they match" and 0 for "they do not match", so you can
use

{ =or({ COMPARE "{ MERGEFIELD doc_param }" = "ap.*" },expression2) }

But as long as "False" is always expressed as 0 and "True" is always
expressed as 1 (which is what happens if you do your comparisons using
COMPARE, or IF as above), you can do multiple or s within an = field using
simple addition, e.g.

{ ={ COMPARE "{ MERGEFIELD doc_param }" = "ap.*" }+
{ IF "{ MERGEFIELD doc_param }" = "ap.*" "1" "0" } }

should return 0 if neither expression is true and >0 otherwise.

Often, people want to return one text if one or more of several conditions
is true and another text otherwise. In that case, you usually need to wrap
the whole {=} field up in a final IF, e.g. using the above addition approach

{ IF { ={ COMPARE "{ MERGEFIELD doc_param }" = "ap.*" }+
{ IF "{ MERGEFIELD doc_param }" = "ap.*" "1" "0" } } = 0
"it's all false" "at least one of them is true" }

Peter Jamieson