Your original configuration looks almost correct to me:
<expression>mytable.status</expression>
Fully qualified means that the schema is also part of the name, i.e. you should try either of these:
<expression>.*\.mytable\.status</expression>
<expression>myschema\.mytable\.status</expression>
Also, be sure to use the correct casing. Case-insensitive regexes can also be used:
<expression>(?i:.*\.mytable\.status)</expression>
<expression>(?i:myschema\.mytable\.status)</expression>