Syntax for findrx/replecerx

[stupomer]

This is a simplified version of what I am trying to do

Code:

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str md
str pattern = ", (MD|DDS|NP|PHD)"
md.replacerx(pattern "")

Whether the initial version of md is
md = "John J Doe, MD"
or
md = "John J Doe, DDS"
or
md = "John J Doe, NP"
or
md = "John J Doe, PHD"

I want the final version of md to be "John J Doe"

I am not sure why my regex is not working. Any ideas?

Stuart