T7092: Regex for registry location

Author: sskaje

interface-definitions/container.xml.in

@@ -546,7 +546,10 @@
           </leafNode>
           <leafNode name="mirror">
             <properties>
-              <help>Registry mirror, use host:port</help>
+              <help>Registry mirror, use host[:port][/path]</help>
+              <constraint>
+                <regex>^(?:[[:alnum:]-]+(?:\.[[:alnum:]-]+)*|(?:[[:digit:]]{1,3}\.){3}[[:digit:]]{1,3}|\[[[:xdigit:]:]+])(?::[[:digit:]]{1,5})?(?:\/[^[:space:]?#]*)?$</regex>
+              </constraint>
             </properties>
           </leafNode>
         </children>