Fixed platform_define pattern matching

rebar.config

@@ -21,9 +21,9 @@
 
 {erl_opts, [
     {lager_extra_sinks, ['__lager_test_sink']},
-    {platform_define, "(19|20|21)", test_statem},
-    {platform_define, "(18)", 'FUNCTION_NAME', unavailable},
-    {platform_define, "(18)", 'FUNCTION_ARITY', 0},
+    {platform_define, "^(19|20|21)", test_statem},
+    {platform_define, "^18", 'FUNCTION_NAME', unavailable},
+    {platform_define, "^18", 'FUNCTION_ARITY', 0},
     debug_info,
     report,
     verbose,