diff --git a/include/configreader.h b/include/configreader.h
index a82420b4e..b603f2e10 100644
--- a/include/configreader.h
+++ b/include/configreader.h
@@ -42,6 +42,8 @@ class CoreExport ConfigTag : public refcountbase
 	const std::string src_name;
 	const int src_line;
 
+	/** Get the value of an option, using def if it does not exist */
+	std::string getString(const std::string& key, const std::string& def, const TR1NS::function<bool(const std::string&)>& validator);
 	/** Get the value of an option, using def if it does not exist */
 	std::string getString(const std::string& key, const std::string& def = "", size_t minlen = 0, size_t maxlen = UINT32_MAX);
 	/** Get the value of an option, using def if it does not exist */
diff --git a/src/configparser.cpp b/src/configparser.cpp
index 8a3042eba..627cd78e1 100644
--- a/src/configparser.cpp
+++ b/src/configparser.cpp
@@ -402,6 +402,21 @@ bool ConfigTag::readString(const std::string& key, std::string& value, bool allo
 	return false;
 }
 
+std::string ConfigTag::getString(const std::string& key, const std::string& def, const TR1NS::function<bool(const std::string&)>& validator)
+{
+	std::string res;
+	if (!readString(key, res))
+		return def;
+
+	if (!validator(res))
+	{
+		ServerInstance->Logs->Log("CONFIG", LOG_DEFAULT, "WARNING: The value of <%s:%s> is not valid; value set to %s.",
+			tag.c_str(), key.c_str(), def.c_str());
+		return def;
+	}
+	return res;
+}
+
 std::string ConfigTag::getString(const std::string& key, const std::string& def, size_t minlen, size_t maxlen)
 {
 	std::string res;