Brilliant!

Works perfectly

Correct. Adding the qualifiers and using double-quotes did the trick

For string: 0508:F00002R this works "4N1"":F""5N1""R""" 

For string: 0508:CX00002R this works "4N1"":CX""5N1""R"""

Thanks!

I have a routing rule that uses Matches e.g. Matches "1P4N1P1A5N1A1P" that matches against this string <0508:F00002R>

How do I include literals within the expression editor?

Pattern match doc indicates something like this 1P4N":F"5N"R"1P

Since within the expression is surrounded by double-quotes, that breaks the syntax in the editor.

Have tried many variations, none of which work.