diff --git a/src/Data/Text/Region.hs b/src/Data/Text/Region.hs
--- a/src/Data/Text/Region.hs
+++ b/src/Data/Text/Region.hs
@@ -4,7 +4,7 @@
 	pt, start, lineStart, regionLength, till, linesSize, regionLines, emptyRegion, line,
 	regionSize, expandLines, atRegion, overlaps, applyMap, cutMap, insertMap,
 	cutRegion, insertRegion,
-	EditAction(..), cut, paste, overwrite, apply, update,
+	EditAction(..), replace, cut, paste, overwrite, apply, update, undo,
 
 	module Data.Text.Region.Types
 	) where
@@ -107,7 +107,7 @@
 
 class Editable s ⇒ EditAction e s where
 	-- | Make replace action over 'Region' and 'Contents'
-	replace ∷ Region → Contents s → e s
+	replaceAction ∷ Region → Contents s → e s
 	-- | Make 'Map' from action
 	actionMap ∷ e s → Map
 	-- | Perform action, modifying 'Contents'
@@ -115,34 +115,43 @@
 	-- | Get action undo
 	inversed ∷ e s → Contents s → e s
 
+-- | Replace region with data
+replace ∷ EditAction e s ⇒ Region → s → e s
+replace r = replaceAction r ∘ view contents
+
 -- | Cuts region
 cut ∷ EditAction e s ⇒ Region → e s
-cut r = replace r emptyContents
+cut r = replaceAction r emptyContents
 
 -- | Pastes 'Contents' at some 'Point'
-paste ∷ EditAction e s ⇒ Point → Contents s → e s
-paste p = replace (p `till` p)
+paste ∷ EditAction e s ⇒ Point → s → e s
+paste p = replaceAction (p `till` p) ∘ view contents
 
 -- | Overwrites 'Contents' at some 'Point'
-overwrite ∷ EditAction e s ⇒ Point → Contents s → e s
-overwrite p c = replace (p `regionSize` measure c) c
+overwrite ∷ EditAction e s ⇒ Point → s → e s
+overwrite p c = replaceAction (p `regionSize` measure cts) cts where
+	cts = view contents c
 
 -- | 'perform' for 'Edit'
-apply ∷ Editable s ⇒ Edit s → Contents s → Contents s
-apply = perform
+apply ∷ Editable s ⇒ Edit s → s → s
+apply = over contents ∘ perform
 
+-- | Get undo
+undo ∷ Editable s ⇒ Edit s → s → Edit s
+undo e = inversed e ∘ view contents
+
 -- | Update regions
-update ∷ Editable s ⇒ Edit s → Region → Region
-update = applyMap ∘ actionMap
+update ∷ (Editable s, Regioned r) ⇒ Edit s → r → r
+update e = over regions (applyMap ∘ actionMap $ e)
 
 instance Editable s ⇒ EditAction Replace s where
-	replace = Replace
+	replaceAction = Replace
 	actionMap (Replace r w) = insertMap (r & regionLength .~ measure w) `mappend` cutMap r
 	perform (Replace r w) cts = cts & atRegion r .~ w
 	inversed (Replace r w) cts = Replace (r & regionLength .~ measure w) (cts ^. atRegion r)
 
 instance Editable s ⇒ EditAction Edit s where
-	replace rgn txt = Edit [replace rgn txt]
+	replaceAction rgn txt = Edit [replaceAction rgn txt]
 	actionMap = foldr go mempty ∘ view replaces where
 		go r m = actionMap (over replaceRegion (applyMap m) r) `mappend` m
 	perform = snd ∘ foldr go (mempty, id) ∘ view replaces where
diff --git a/src/Data/Text/Region/Types.hs b/src/Data/Text/Region/Types.hs
--- a/src/Data/Text/Region/Types.hs
+++ b/src/Data/Text/Region/Types.hs
@@ -8,6 +8,7 @@
 	concatCts, splitCts, splitted,
 	Editable(..), contents, by, measure,
 	Replace(..), replaceRegion, replaceWith, Edit(..), replaces,
+	Regioned(..),
 
 	module Data.Group
 	) where
@@ -193,3 +194,18 @@
 
 instance (Editable s, FromJSON s) ⇒ FromJSON (Edit s) where
 	parseJSON = fmap Edit ∘ parseJSON
+
+class Regioned a where
+	regions ∷ Traversal' a Region
+
+instance Regioned Point where
+	regions = pointRegion
+
+instance Regioned Region where
+	regions = id
+
+instance Regioned (Replace s) where
+	regions = replaceRegion
+
+instance Regioned (Edit s) where
+	regions = replaces . each . replaceRegion
diff --git a/tests/Test.hs b/tests/Test.hs
--- a/tests/Test.hs
+++ b/tests/Test.hs
@@ -1,3 +1,5 @@
+{-# LANGUAGE FlexibleContexts #-}
+
 module Main (
 	main
 	) where
@@ -27,18 +29,18 @@
 main = hspec $ do
 	describe "regions are updated" $ do
 		it "should delete correctly" $
-			apply (cut quux `mappend` cut bar) (by text) ≡ by "foo baz"
+			apply (cut quux `mappend` cut bar) text ≡ "foo baz"
 		it "should perform undo" $
 			let
-				act' = mconcat [cut bar, replace quux (by nums), paste start (by xxx)]
-				undo' = inversed act' (by text)
+				act' = mconcat [cut bar, replace quux nums, paste start xxx]
+				undo' = undo act' text
 			in
-			(apply undo' ∘ apply act') (by text) ≡ by text
+			(apply undo' ∘ apply act') text ≡ text
 		it "should reverse text" $
 			let
 				go 0 _ txt = txt
-				go n c txt = go (n - 1) (over pointRegion (update act') c) (apply act' txt) where
-					act' = mconcat [cut first, paste c (txt ^. atRegion first)]
+				go n c txt = go (n - 1) (update act' c) (apply act' txt) where
+					act' = mconcat [cut first, paste c (txt ^. contents . atRegion first . from contents)]
 					first = pt 0 0 `till` pt 0 1
 			in
-			go (length text) (pt 0 (length text)) (by text) ≡ by (reverse text)
+			go (length text) (pt 0 (length text)) text ≡ reverse text
diff --git a/text-region.cabal b/text-region.cabal
--- a/text-region.cabal
+++ b/text-region.cabal
@@ -1,5 +1,5 @@
 name:                text-region
-version:             0.2.0.0
+version:             0.3.0.0
 synopsis:            Marking text regions
 description: Provides functions to update text region positions according to text edit actions
 homepage:            https://github.com/mvoidex/text-region