From 3aacfa079ec96c6f397905eb4f521cebc266547e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rub=C3=A9n=20Norte?= <rubennorte@fb.com>
Date: Thu, 21 Feb 2019 22:09:05 +0000
Subject: [PATCH] Improve regex to replace root dir

---
 packages/babel-jest/src/index.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/packages/babel-jest/src/index.ts b/packages/babel-jest/src/index.ts
index 9ef0c5c44544..ff634be2b2b5 100644
--- a/packages/babel-jest/src/index.ts
+++ b/packages/babel-jest/src/index.ts
@@ -69,7 +69,7 @@ const createTransformer = (
   function getRootDirRegExp(rootDir: Config.Path): RegExp {
     if (!rootDirRegExpCache[rootDir]) {
       rootDirRegExpCache[rootDir] = new RegExp(
-        `^${escapeStrForRegex(rootDir)}(${escapeStrForRegex(path.sep)}|$)`,
+        `^${escapeStrForRegex(rootDir)}(?=${escapeStrForRegex(path.sep)}|$)`,
       );
     }
 
@@ -86,7 +86,7 @@ const createTransformer = (
     // babel options to relativize paths
     return JSON.stringify(babelOptions.options, (_key, value) => {
       if (typeof value === 'string') {
-        return value.replace(rootDirRegExp, '<rootDir>$1');
+        return value.replace(rootDirRegExp, '<rootDir>');
       }
       return value;
     });