If I understand this... It's a proxy chain, so they whole list needs to match:
`proxy1", "proxy2", "^proxy3/[a-z]*/"`
which doesn't not match (because ABC is capitalized):
`<cas:proxy>proxy1</cas:proxy><cas:proxy>proxy2</cas:proxy><cas:proxy>proxy3/ABC/</cas:proxy>`

Is my understanding wrong here?