1 files changed, 4 insertions, 0 deletions
diff --git a/lib/default.nix b/lib/default.nix
index 9399a0107..803a614a1 100644
--- a/lib/default.nix
+++ b/lib/default.nix
@@ -29,6 +29,10 @@ let
 
     setAttr = name: value: set: set // { ${name} = value; };
 
+    test = re: x: isString x && testString re x;
+
+    testString = re: x: match re x != null;
+
     toC = x: let
       type = typeOf x;
       reject = throw "cannot convert ${type}";