diff --git a/include/ss/setup.hpp b/include/ss/setup.hpp
new file mode 100644
index 0000000..4474d96
--- /dev/null
+++ b/include/ss/setup.hpp
@@ -0,0 +1,111 @@
+#pragma once
+#include "type_traits.hpp"
+#include <array>
+
+namespace ss {
+
+template <char... Cs>
+struct matcher {
+private:
+    template <char X, char... Xs>
+    static bool match_impl(char c) {
+        if constexpr (sizeof...(Xs) != 0) {
+            return (c == X) || match_impl<Xs...>(c);
+        }
+        return (c == X);
+    }
+
+    constexpr static bool contains_string_terminator() {
+        for (const auto& match : matches) {
+            if (match == '\0') {
+                return false;
+            }
+        }
+        return true;
+    }
+
+public:
+    static bool match(char c) {
+        return match_impl<Cs...>(c);
+    }
+
+    constexpr static bool enabled = true;
+    constexpr static std::array<char, sizeof...(Cs)> matches{Cs...};
+    static_assert(contains_string_terminator(),
+                  "string terminator cannot be used as a match character");
+};
+
+template <typename FirstMatcher, typename SecondMatcher>
+constexpr bool matches_intersect() {
+    for (const auto& first_match : FirstMatcher::matches) {
+        for (const auto& second_match : SecondMatcher::matches) {
+            if (first_match != '\0' && first_match == second_match) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
+
+template <>
+class matcher<'\0'> {
+public:
+    constexpr static bool enabled = false;
+    constexpr static std::array<char, 1> matches{'\0'};
+    static bool match(char c) = delete;
+};
+
+template <char C>
+struct quote : matcher<C> {};
+
+template <char... Cs>
+struct trim : matcher<Cs...> {};
+
+template <char... Cs>
+struct escape : matcher<Cs...> {};
+
+template <typename T, template <char...> class Template>
+struct is_instance_of_matcher {
+    constexpr static bool value = false;
+};
+
+template <char... Ts, template <char...> class Template>
+struct is_instance_of_matcher<Template<Ts...>, Template> {
+    constexpr static bool value = true;
+};
+
+template <template <char...> class Matcher, typename... Ts>
+struct get_matcher;
+
+template <template <char...> class Matcher, typename T, typename... Ts>
+struct get_matcher<Matcher, T, Ts...> {
+    using type =
+        typename ternary<is_instance_of_matcher<T, Matcher>::value, T,
+                         typename get_matcher<Matcher, Ts...>::type>::type;
+};
+
+template <template <char...> class Matcher>
+struct get_matcher<Matcher> {
+    using type = Matcher<'\0'>;
+};
+
+template <template <char...> class Matcher, typename... Ts>
+using get_matcher_t = typename get_matcher<Matcher, Ts...>::type;
+
+template <typename... Ts>
+struct setup {
+    using quote = get_matcher_t<quote, Ts...>;
+    using trim = get_matcher_t<trim, Ts...>;
+    using escape = get_matcher_t<escape, Ts...>;
+
+#define ASSERT_MSG "cannot have the same character in multiple matchers"
+    static_assert(!matches_intersect<quote, trim>(), ASSERT_MSG);
+    static_assert(!matches_intersect<trim, escape>(), ASSERT_MSG);
+    static_assert(!matches_intersect<escape, quote>(), ASSERT_MSG);
+#undef ASSERT_MSG
+};
+
+template <typename... Ts>
+struct setup<setup<Ts...>> : setup<Ts...> {};
+
+} /* ss */
diff --git a/include/ss/splitter.hpp b/include/ss/splitter.hpp
index 8180590..aa35109 100644
--- a/include/ss/splitter.hpp
+++ b/include/ss/splitter.hpp
@@ -1,4 +1,5 @@
 #pragma once
+#include "setup.hpp"
 #include "type_traits.hpp"
 #include <cstdlib>
 #include <cstring>
@@ -6,78 +7,6 @@
 #include <vector>
 
 namespace ss {
-template <char... Cs>
-struct matcher {
-private:
-    template <char X, char... Xs>
-    static bool match_impl(char c) {
-        if constexpr (sizeof...(Xs) != 0) {
-            return (c == X) || match_impl<Xs...>(c);
-        }
-        return (c == X);
-    }
-
-public:
-    static bool match(char c) {
-        return match_impl<Cs...>(c);
-    }
-    constexpr static bool enabled = true;
-};
-
-template <>
-class matcher<'\0'> {
-public:
-    constexpr static bool enabled = false;
-    static bool match(char c) = delete;
-};
-
-template <char C>
-struct quote : matcher<C> {};
-
-template <char... Cs>
-struct trim : matcher<Cs...> {};
-
-template <char... Cs>
-struct escape : matcher<Cs...> {};
-
-template <typename T, template <char...> class Template>
-struct is_instance_of_matcher {
-    constexpr static bool value = false;
-};
-
-template <char... Ts, template <char...> class Template>
-struct is_instance_of_matcher<Template<Ts...>, Template> {
-    constexpr static bool value = true;
-};
-
-template <template <char...> class Matcher, typename... Ts>
-struct get_matcher;
-
-template <template <char...> class Matcher, typename T, typename... Ts>
-struct get_matcher<Matcher, T, Ts...> {
-    using type =
-        typename ternary<is_instance_of_matcher<T, Matcher>::value, T,
-                         typename get_matcher<Matcher, Ts...>::type>::type;
-};
-
-template <template <char...> class Matcher>
-struct get_matcher<Matcher> {
-    using type = Matcher<'\0'>;
-};
-
-template <template <char...> class Matcher, typename... Ts>
-using get_matcher_t = typename get_matcher<Matcher, Ts...>::type;
-
-// TODO add static asserts
-template <typename... Ts>
-struct setup {
-    using quote = get_matcher_t<quote, Ts...>;
-    using trim = get_matcher_t<trim, Ts...>;
-    using escape = get_matcher_t<escape, Ts...>;
-};
-
-template <typename... Ts>
-struct setup<setup<Ts...>> : setup<Ts...> {};
 
 using string_range = std::pair<const char*, const char*>;
 using split_input = std::vector<string_range>;