JBoss EAP 6.4 and 7.0 fails to starts up when resolving an expression with the default value containing a '$' at the end

Issue

JBoss EAP 6.4 and 7.0 fails to starts up when resolving an expression with the default value containing a '$' at the end.

For example, when I configured the following system property in standalone.xml:

<system-properties>
    <property name="regex_prop_test" value="${my.regex.test:^default$}"/>
</system-properties>

Then JBoss failed to start-up with the following ERROR message:

ERROR [org.jboss.as.controller.management-operation] (Controller Boot Thread) JBAS014612: Operation ("add") failed - address: ([("system-property" => "regex_prop_test")]) - failure description: "JBAS013494: Incomplete expression: ${my.regex.test:^default$}"