diff --git a/tools/fieldRename.ts b/tools/fieldRename.ts
index 3fc6e6e..dedda92 100644
--- a/tools/fieldRename.ts
+++ b/tools/fieldRename.ts
@@ -123,8 +123,9 @@ class RenameFields implements ITool {
       const match = patternRegex.exec(name);
       if (match) {
         const toChange = evaluateChange(change, match);
+        const preview = name.replace(new RegExp(patternRegex), toChange);
         foundUpdates.push([
-          `${colorize(name, "red")} -> ${colorize(toChange, "green")}`,
+          `${colorize(name, "red")} -> ${colorize(preview, "green")}`,
           () => {
             applyRename(field, name, patternRegex, toChange);
           },