res_sorcery_realtime: Fix regex regression.

A regression was introduced where searching for realtime PJSIP objects
by regex by starting the regex with a leading "^" would cause no items
to be returned.

This was due to a change which attempted to drop the requirement for a
leading "^" to be present due to how some CLI commands formulate their
regexes. However, the change, rather than simply eliminating the
requirement, caused any regexes that did begin with "^" to end up not
returning the expected results.

This change fixes the problem by inspecting the regex and formulating
the realtime query differently depending on if it begins with "^".

ASTERISK-25702 #close
Reported by Nic Colledge

Patches:
    realtime_retrieve_regex.patch submitted by Alexei Gradinari License #5691

Change-Id: I055df608a6e6a10732044fa737a9fe8dca602693

res/res_sorcery_realtime.c

@@ -223,7 +223,11 @@ static void sorcery_realtime_retrieve_regex(const struct ast_sorcery *sorcery, v
 
 	/* The realtime API provides no direct ability to do regex so for now we support a limited subset using pattern matching */
 	snprintf(field, sizeof(field), "%s LIKE", UUID_FIELD);
-	snprintf(value, sizeof(value), "%%%s%%", regex);
+	if (regex[0] == '^') {
+		snprintf(value, sizeof(value), "%s%%", regex + 1);
+	} else {
+		snprintf(value, sizeof(value), "%%%s%%", regex);
+	}
 
 	if (!(fields = ast_variable_new(field, value, ""))) {
 		return;