diff --git a/packages/react-devtools-shared/src/backend/utils.js b/packages/react-devtools-shared/src/backend/utils.js
index f0f78b7f778b5..8794125ff8f8f 100644
--- a/packages/react-devtools-shared/src/backend/utils.js
+++ b/packages/react-devtools-shared/src/backend/utils.js
@@ -188,7 +188,7 @@ export function formatWithStyles(
   }
 
   // Matches any of %(o|O|d|i|s|f), but not %%(o|O|d|i|s|f)
-  const REGEXP = /([^%]|^)(%([oOdisf]))/g;
+  const REGEXP = /(?<!%)((%%)*)(%([oOdisf]))/g;
   if (inputArgs[0].match(REGEXP)) {
     return [`%c${inputArgs[0]}`, style, ...inputArgs.slice(1)];
   } else {
diff --git a/packages/react-devtools-shared/src/hook.js b/packages/react-devtools-shared/src/hook.js
index ad5b33850b765..35094e84b7e32 100644
--- a/packages/react-devtools-shared/src/hook.js
+++ b/packages/react-devtools-shared/src/hook.js
@@ -189,7 +189,7 @@ export function installHook(target: any): DevToolsHook | null {
     }
 
     // Matches any of %(o|O|d|i|s|f), but not %%(o|O|d|i|s|f)
-    const REGEXP = /([^%]|^)(%([oOdisf]))/g;
+    const REGEXP = /(?<!%)((%%)*)(%([oOdisf]))/g;
     if (inputArgs[0].match(REGEXP)) {
       return [`%c${inputArgs[0]}`, style, ...inputArgs.slice(1)];
     } else {