diff --git a/Code/Editor/Plugins/ProjectSettingsTool/Validators.cpp b/Code/Editor/Plugins/ProjectSettingsTool/Validators.cpp
index 8484a2937a..c17da8e40b 100644
--- a/Code/Editor/Plugins/ProjectSettingsTool/Validators.cpp
+++ b/Code/Editor/Plugins/ProjectSettingsTool/Validators.cpp
@@ -172,8 +172,9 @@ namespace ProjectSettingsTool
         // Returns true if valid ios version number
         RetType IOSVersionNumber(const QString& value)
         {
+            // support up to 4-component numerical-only version strings
             return RegularExpressionValidator
-                       ("(0|[1-9][0-9]{0,8}|[1-2][0-1][0-9]{0,8})(\\.(0|[1-9][0-9]{0,8}|[1-2][0-1][0-9]{0,8})){0,2}",
+                       ("^(\\d+)(\\.\\d+){0,3}$",
                        value,
                        maxIosVersionLength);
         }