try to abstract matcher

internal/matcher/matcher.go

@@ -0,0 +1,13 @@
+package matcher
+
+type Unit interface {
+	MatchByPattern(value string) (pattern string)
+	Match(value string) bool
+
+	// Move this to init stage because some of matchers
+	// might not be applicable to it
+	RegisterRegexp(regexpPattern string)
+	Register(pattern string)
+
+	Patterns() []string
+}