diff --git a/src/window.cc b/src/window.cc
index c1792d2d..6fd4c541 100644
--- a/src/window.cc
+++ b/src/window.cc
@@ -213,6 +213,21 @@ void Window::select(const Selector& selector, bool append)
     scroll_to_keep_cursor_visible_ifn();
 }
 
+void Window::multi_select(const MultiSelector& selector)
+{
+    check_invariant();
+
+    SelectionList new_selections;
+    for (auto& sel : m_selections)
+    {
+        SelectionList selections = selector(sel);
+        std::copy(selections.begin(), selections.end(),
+                  std::back_inserter(new_selections));
+    }
+    m_selections = std::move(new_selections);
+    scroll_to_keep_cursor_visible_ifn();
+}
+
 BufferString Window::selection_content() const
 {
     check_invariant();
diff --git a/src/window.hh b/src/window.hh
index 133d44d1..a3d1c4ab 100644
--- a/src/window.hh
+++ b/src/window.hh
@@ -39,6 +39,7 @@ class Window
 public:
     typedef BufferString String;
     typedef std::function<Selection (const BufferIterator&)> Selector;
+    typedef std::function<SelectionList (const Selection&)>  MultiSelector;
 
     void erase();
     void insert(const String& string);
@@ -58,6 +59,7 @@ public:
 
     void clear_selections();
     void select(const Selector& selector, bool append = false);
+    void multi_select(const MultiSelector& selector);
     BufferString selection_content() const;
     const SelectionList selections() const { return m_selections; }