Use_backend with acl url_reg failed after upgrade from 1.8 -> 2.2

Help!
1

Hello,

with upgrade to 2.2 my acl for use_backend directive no longer work. I’ve no idea what happen:

    acl is_testxy url_reg ^\/testxy/.*
    acl is_testxy url_reg ^\/testxy
    use_backend Backend-web2 if is_testxy

url which should match: https://example.com/testxy/test.html

I’ve no idea why my regex work in 1.8 but not in 2.2?

THX!