Parser error with regex

Yangtools Be fails to parse the attached tail-f AAA model.
This is with patch for YANGTOOLS-605 applied.

Caused by: java.lang.IllegalArgumentException: Failed to parse element [password: null] as leaf AbsoluteSchemaPath

{path=[(http://tail-f.com/ns/aaa/1.1?revision=2015-06-16)aaa, (http://tail-f.com/ns/aaa/1.1?revision=2015-06-16)authentication, (http://tail-f.com/ns/aaa/1.1?revision=2015-06-16)users, (http://tail-f.com/ns/aaa/1.1?revision=2015-06-16)user, (http://tail-f.com/ns/aaa/1.1?revision=2015-06-16)password]}

Caused by: java.lang.IllegalArgumentException: String ^$0$.*|$1$[a-zA-Z0-9./]

{1,8}

$[a-zA-Z0-9./]

{22}

|$5$(rounds=\d+$)?[a-zA-Z0-9./]

{1,16}$[a-zA-Z0-9./]{43}|$6$(rounds=\d+$)?[a-zA-Z0-9./]{1,16}

$[a-zA-Z0-9./]

{86}

$ is not valid regular expression. [$1$T5co0bho$6f5XVLunApUppu2fZpOa51]
at com.google.common.base.Preconditions.checkArgument(Preconditions.java:145)[64:com.google.guava:18.0.0]
at org.opendaylight.yangtools.yang.data.impl.codec.CompiledPatternContext.validate(CompiledPatternContext.java:31