pass through regex evaluation error to user

lib/admin/Controller/subscriber.pm

@@ -2341,8 +2341,10 @@ sub save_trusted_source : Local {
     $messages{protocol_err} = 'Client.Syntax.UnknownProtocol' unless $checkresult;
 
     if (length $ts{from_pattern}) { # allow empty sipuri
-        $messages{from_pattern_err} = 'Client.Syntax.MalformedUri'
-            unless ($c->model('Provisioning')->call_prov( $c, 'voip', 'check_sip_uri_pattern', $ts{from_pattern}, \$checkresult));
+        unless ($c->model('Provisioning')->call_prov( $c, 'voip', 'check_sip_uri_pattern', $ts{from_pattern}, \$checkresult)) {
+            $messages{from_pattern_err} = 'Client.Syntax.MalformedUri';
+            $c->flash->{from_pattern_err_detail} = $c->session->{prov_error_object} if ($c->session->{prov_error_object});
+        }
     }
     else {
          $ts{from_pattern} = undef;

root/tt/trusted_peer.tt

@@ -5,7 +5,14 @@
 [% IF messages.tsrc_msg %]<div class="msgor">[% messages.tsrc_msg %]</div>[% END %]
 [% IF messages.src_ip_err %]<div class="error">[% messages.src_ip_err %]</div>[% END %]
 [% IF messages.protocol_err %]<div class="error">[% messages.protocol_err %]</div>[% END %]
-[% IF messages.from_pattern_err %]<div class="error">[% messages.from_pattern_err %]</div>[% END %]
+[% IF messages.from_pattern_err %]
+    <div class="error">[% messages.from_pattern_err %]
+    [% IF from_pattern_err_detail %]
+        <br />
+        [% from_pattern_err_detail %]
+    [% END %]
+    </div>
+[% END %]
 
 <ul class="cleanlist">
 <li class="ui-state-default">