Weird quoting to preserve the [^0-9] as it is needed, M4 swallowed the brackets.
Weird quoting to preserve the [^0-9] as it is needed, M4 swallowed the brackets.

nadult/mpg123,nadult/mpg123,nadult/mpg123,nadult/mpg123,nadult/mpg123,nadult/mpg123,nadult/mpg123