diff --git a/openbsc/src/libmsc/gsm_04_08.c b/openbsc/src/libmsc/gsm_04_08.c
index 74da34b..92c4cfe 100644
--- a/openbsc/src/libmsc/gsm_04_08.c
+++ b/openbsc/src/libmsc/gsm_04_08.c
@@ -25,9 +25,12 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <stdbool.h>
 #include <errno.h>
 #include <time.h>
 #include <netinet/in.h>
+#include <regex.h>
+#include <sys/types.h>
 
 #include "bscconfig.h"
 
@@ -244,6 +247,17 @@
 	return -EINVAL; /* not reached */
 }
 
+static bool subscr_regexp_check(const struct gsm_network *net, const char *imsi)
+{
+	if (!net->authorized_reg_str)
+		return false;
+
+	if (regexec(&net->authorized_regexp, imsi, 0, NULL, 0) != REG_NOMATCH)
+		return true;
+
+	return false;
+}
+
 static int authorize_subscriber(struct gsm_loc_updating_operation *loc,
 				struct gsm_subscriber *subscriber)
 {
@@ -261,6 +275,13 @@
 	switch (subscriber->group->net->auth_policy) {
 	case GSM_AUTH_POLICY_CLOSED:
 		return subscriber->authorized;
+	case GSM_AUTH_POLICY_REGEXP:
+		if (subscriber->authorized)
+			return 1;
+		if (subscr_regexp_check(subscriber->group->net,
+					subscriber->imsi))
+			subscriber->authorized = 1;
+		return subscriber->authorized;
 	case GSM_AUTH_POLICY_TOKEN:
 		if (subscriber->authorized)
 			return subscriber->authorized;
@@ -509,10 +530,14 @@
 static struct gsm_subscriber *subscr_create(const struct gsm_network *net,
 					    const char *imsi)
 {
-	if (net->subscr_creation_mode != GSM_SUBSCR_DONT_CREATE)
-		return subscr_create_subscriber(net->subscr_group, imsi);
+	if (net->subscr_creation_mode == GSM_SUBSCR_DONT_CREATE)
+		return NULL;
 
-	return NULL;
+	if (net->subscr_creation_mode & GSM_SUBSCR_CREAT_W_REGEXP)
+		if (!subscr_regexp_check(net, imsi))
+			return NULL;
+
+	return subscr_create_subscriber(net->subscr_group, imsi);
 }
 
 /* Parse Chapter 9.2.11 Identity Response */
diff --git a/openbsc/src/libmsc/vty_interface_layer3.c b/openbsc/src/libmsc/vty_interface_layer3.c
index 5d74e04..3f67b9a 100644
--- a/openbsc/src/libmsc/vty_interface_layer3.c
+++ b/openbsc/src/libmsc/vty_interface_layer3.c
@@ -1032,11 +1032,15 @@
 }
 
 DEFUN(cfg_nitb_subscr_create, cfg_nitb_subscr_create_cmd,
-      "subscriber-create-on-demand",
-      "Make a new record when a subscriber is first seen.\n")
+      "subscriber-create-on-demand [regexp]",
+      "Make a new record when a subscriber is first seen.\n"
+      "Create subscribers only if IMSI matches the regexp specified in "
+      "authorized-regexp command\n")
 {
 	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
 	gsmnet->subscr_creation_mode = GSM_SUBSCR_CREAT_W_RAND_EXT;
+	if (argc)
+		gsmnet->subscr_creation_mode |= GSM_SUBSCR_CREAT_W_REGEXP;
 	return CMD_SUCCESS;
 }
 
@@ -1070,9 +1074,12 @@
 static int config_write_nitb(struct vty *vty)
 {
 	struct gsm_network *gsmnet = gsmnet_from_vty(vty);
+	enum gsm_subscr_creation_mode scm = gsmnet->subscr_creation_mode;
+	const char *reg = (scm & GSM_SUBSCR_CREAT_W_REGEXP) ? " regexp" : "",
+		*pref = scm ? "" : "no ";
 	vty_out(vty, "nitb%s", VTY_NEWLINE);
-	vty_out(vty, " %ssubscriber-create-on-demand%s",
-		gsmnet->subscr_creation_mode ? "" : "no ", VTY_NEWLINE);
+	vty_out(vty, " %ssubscriber-create-on-demand%s%s",
+		pref, reg, VTY_NEWLINE);
 	vty_out(vty, " %sassign-tmsi%s",
 		gsmnet->avoid_tmsi ? "no " : "", VTY_NEWLINE);
 	return CMD_SUCCESS;