diff --git a/cmd/cli/main.go b/cmd/cli/main.go
index 6940090..9348c38 100644
--- a/cmd/cli/main.go
+++ b/cmd/cli/main.go
@@ -3,6 +3,8 @@ package cli
 import (
 	"flag"
 	"fmt"
+	"io"
+	"maps"
 	"os"
 	"slices"
 
@@ -85,32 +87,67 @@ func Main() {
 			balances = balances.NotLike(notLikePattern)
 		}
 
-		keys := []string{}
-		for k := range balances {
-			keys = append(keys, k)
-		}
-		slices.Sort(keys)
-
-		max := 0
-		for _, k := range keys {
-			if n := len(k); n > max {
-				max = n
-			}
-		}
-
-		format := fmt.Sprintf("%%-%ds\t%%s%%.2f\n", max)
-		for _, key := range keys {
-			for currency, v := range balances[key] {
-				if currency != "$" {
-					currency += " "
-				}
-				fmt.Printf(format, key, currency, v)
-			}
-		}
+		FPrintBalances(os.Stdout, balances)
 	case "reg":
-		// register := deltas.Register()
-		panic(cmd)
+		register := deltas.Register()
+		if likePattern != "" {
+			register = register.Like(likePattern)
+		}
+		if notLikePattern != "" {
+			register = register.NotLike(notLikePattern)
+		}
+
+		var prev ledger.Balances
+		for _, date := range register.Dates() {
+			balances := register[date]
+
+			newBalances := make(ledger.Balances)
+			for k, v := range balances {
+				if got := prev[k]; !maps.Equal(v, got) {
+					newBalances[k] = v
+				}
+			}
+
+			if len(newBalances) > 0 {
+				fmt.Println(date)
+				FPrintBalances(os.Stdout, newBalances)
+			}
+
+			prev = balances
+		}
 	default:
 		panic("unknown command " + positional[0])
 	}
 }
+
+func FPrintBalances(w io.Writer, balances ledger.Balances) {
+	keys := []string{}
+	for k := range balances {
+		keys = append(keys, k)
+	}
+	slices.Sort(keys)
+
+	max := 0
+	for _, k := range keys {
+		if n := len(k); n > max {
+			max = n
+		}
+	}
+
+	format := fmt.Sprintf("%%-%ds\t%%s%%.2f\n", max)
+	for _, key := range keys {
+		currencies := []ledger.Currency{}
+		for currency := range balances[key] {
+			currencies = append(currencies, currency)
+		}
+		slices.Sort(currencies)
+
+		for _, currency := range currencies {
+			printableCurrency := currency
+			if printableCurrency != "$" {
+				printableCurrency += " "
+			}
+			fmt.Fprintf(w, format, key, printableCurrency, balances[key][currency])
+		}
+	}
+}
diff --git a/src/ledger/register.go b/src/ledger/register.go
index a72cec6..9f771af 100644
--- a/src/ledger/register.go
+++ b/src/ledger/register.go
@@ -51,6 +51,26 @@ func (register Register) Names() []string {
 	return result
 }
 
+func (register Register) Like(pattern string) Register {
+	result := make(Register)
+	for k, v := range register {
+		if got := v.Like(pattern); len(got) > 0 {
+			result[k] = got
+		}
+	}
+	return result
+}
+
+func (register Register) NotLike(pattern string) Register {
+	result := make(Register)
+	for k, v := range register {
+		if got := v.NotLike(pattern); len(got) > 0 {
+			result[k] = got
+		}
+	}
+	return result
+}
+
 func (register Register) Dates() []string {
 	result := make([]string, 0, len(register))
 	for k := range register {