diff --git a/autoload/scriptease.vim b/autoload/scriptease.vim
index 5b0d32a..ed1b2eb 100644
--- a/autoload/scriptease.vim
+++ b/autoload/scriptease.vim
@@ -225,6 +225,10 @@ function! s:opfunc(t) abort
   return @@
 endfunction
 
+function! s:noop(...)
+  return a:1
+endf
+
 function! scriptease#filterop(...) abort
   if !a:0
     set opfunc=scriptease#filterop
@@ -234,7 +238,11 @@ function! scriptease#filterop(...) abort
   try
     set selection=inclusive clipboard-=unnamed clipboard-=unnamedplus
     let expr = s:opfunc(a:1)
-    let @@ = matchstr(expr, '^\_s\+').scriptease#dump(eval(s:gsub(expr,'\n%(\s*\\)=',''))).matchstr(expr, '\_s\+$')
+    let code = s:function(get(g:, 'scriptease_prefilter', 's:noop'))(expr)
+    let filter_modified = code != expr
+    let code = s:gsub(code,'\n%(\s*\\)=','')
+    let @@ = matchstr(expr, '^\_s\+').scriptease#dump(eval(code)).matchstr(expr, '\_s\+$')
+    let @@ = s:function(get(g:, 'scriptease_postfilter', 's:noop'))(@@, filter_modified, expr)
     if @@ !~# '^\n*$'
       normal! gvp
     endif
diff --git a/doc/scriptease.txt b/doc/scriptease.txt
index 8eb1349..79ed8b6 100644
--- a/doc/scriptease.txt
+++ b/doc/scriptease.txt
@@ -29,6 +29,26 @@ g==                     replace it with the result.  If you press g== on a
 {Visual}g=              Call |eval()| on the selection and replace it with the
                         result.
 
+                                                *g:scriptease_prefilter*
+                                                *g:scriptease_postfilter*
+Define these filter functions to modify selection before it's passed to
+|eval()| so you can convert your expressions to vim-compatible ones.
+>
+    function! StripFloatSuffix_Pre(input)
+      " Strip out f float suffixes.
+      return substitute(a:input, '\v\C(\d)f>', '\1', 'g')
+    endf
+    function! StripFloatSuffix_Post(expr, filter_modified, input)
+      if a:filter_modified
+        " We had f suffixes, so restore them.
+        return substitute(a:expr, '\v\C([0-9.]+)>', '\1f', 'g')
+      endif
+      return a:expr
+    endf
+    let g:scriptease_prefilter = 'StripFloatSuffix_Pre'
+    let g:scriptease_postfilter = 'StripFloatSuffix_Post'
+<
+
                                                 *scriptease-g!*
 g!                      Old alias for |g=|.