diff --git a/helper.go b/helper.go
index 226ad88..fa6fac5 100644
--- a/helper.go
+++ b/helper.go
@@ -109,6 +109,36 @@ func (s *Steps) ReplaceFile(ctx context.Context, filePath string) (context.Conte
 	return s.Replace(ctx, body)
 }
 
+// ReplaceTable performs in-place replacement of vars in table cells.
+func (s *Steps) ReplaceTable(ctx context.Context, data [][]string) (context.Context, error) {
+	ctx, _ = s.Vars(ctx)
+
+	for _, r := range data {
+		for j, cell := range r {
+			_, rc, err := s.ReplaceString(ctx, cell)
+			if err != nil {
+				return ctx, err
+			}
+
+			if rc != cell {
+				r[j] = rc
+			}
+		}
+	}
+
+	return ctx, nil
+}
+
+// ReplaceString replaces vars in a string.
+func (s *Steps) ReplaceString(ctx context.Context, body string) (context.Context, string, error) {
+	ctx, b, err := s.Replace(ctx, []byte(body))
+	if err != nil {
+		return ctx, "", err
+	}
+
+	return ctx, string(b), nil
+}
+
 // Replace replaces vars in bytes slice.
 //
 // This function can help to interpolate variables into predefined templates.
@@ -142,7 +172,12 @@ func (s *Steps) Replace(ctx context.Context, body []byte) (context.Context, []by
 	}
 
 	sort.Slice(varNames, func(i, j int) bool {
-		return len(varNames[i]) > len(varNames[j])
+		// Compare lengths first (longer comes first)
+		if len(varNames[i]) != len(varNames[j]) {
+			return len(varNames[i]) > len(varNames[j])
+		}
+		// If lengths are equal, sort alphabetically
+		return varNames[i] < varNames[j]
 	})
 
 	for _, k := range varNames {
@@ -175,6 +210,11 @@ func (s *Steps) PrepareContext(ctx context.Context) context.Context {
 	return ctx
 }
 
+// AssertString compares payloads and collects variables from JSON fields.
+func (s *Steps) AssertString(ctx context.Context, expected, received string, ignoreAddedJSONFields bool) (context.Context, error) {
+	return s.Assert(ctx, []byte(expected), []byte(received), ignoreAddedJSONFields)
+}
+
 // Assert compares payloads and collects variables from JSON fields.
 func (s *Steps) Assert(ctx context.Context, expected, received []byte, ignoreAddedJSONFields bool) (context.Context, error) {
 	ctx, jc := s.jc(ctx)
diff --git a/helper_test.go b/helper_test.go
new file mode 100644
index 0000000..e00126c
--- /dev/null
+++ b/helper_test.go
@@ -0,0 +1,33 @@
+package vars_test
+
+import (
+	"context"
+	"testing"
+
+	"github.com/godogx/vars"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestSteps_ReplaceTable(t *testing.T) {
+	vs := vars.Steps{}
+
+	ctx, v := vs.Vars(context.Background())
+
+	v.Set("$foo", 12)
+	v.Set("$bar", true)
+	v.Set("$baz", "$foo")
+
+	var table [][]string
+
+	table = append(table, []string{"foo", "bar", "baz"})
+	table = append(table, []string{"$foo_123", "$bar", "1/$baz"})
+
+	_, err := vs.ReplaceTable(ctx, table)
+	require.NoError(t, err)
+
+	assert.Equal(t, [][]string{
+		{"foo", "bar", "baz"},
+		{"12_123", "true", "1/12"},
+	}, table)
+}