Adding upstream version 2.2.2.

Signed-off-by: Daniel Baumann <daniel@debian.org>

pattern.go

@@ -0,0 +1,12 @@
+package gocache
+
+import "path/filepath"
+
+// MatchPattern checks whether a string matches a pattern
+func MatchPattern(pattern, s string) bool {
+	if pattern == "*" {
+		return true
+	}
+	matched, _ := filepath.Match(pattern, s)
+	return matched
+}