Respect unicorn/prefer-regexp-test (#15701)

Author: notoriousmango

e2e/__tests__/__snapshots__/jest.config.ts.test.ts.snap

@@ -1,4 +1,17 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
+// Jest Snapshot v1, https://jestjs.io/docs/snapshot-testing
+
+exports[`falls back to a loader if we encounter a ESM TS config file in a CommonJs project 1`] = `
+"PASS __tests__/a-giraffe.js
+  ✓ giraffe"
+`;
+
+exports[`falls back to a loader if we encounter a ESM TS config file in a CommonJs project 2`] = `
+"Test Suites: 1 passed, 1 total
+Tests:       1 passed, 1 total
+Snapshots:   0 total
+Time:        <<REPLACED>>
+Ran all test suites."
+`;
 
 exports[`on node >=24 invalid JS in jest.config.ts (node with native TS support) 1`] = `
 "Error: Jest: Failed to parse the TypeScript config file <<REPLACED>>
@@ -54,19 +67,6 @@ Time:        <<REPLACED>>
 Ran all test suites."
 `;
 
-exports[`works with jest.config.ts with cjs contents 1`] = `
-"PASS __tests__/a-giraffe.js
-  ✓ giraffe"
-`;
-
-exports[`works with jest.config.ts with cjs contents 2`] = `
-"Test Suites: 1 passed, 1 total
-Tests:       1 passed, 1 total
-Snapshots:   0 total
-Time:        <<REPLACED>>
-Ran all test suites."
-`;
-
 exports[`works with tsconfig.json 1`] = `
 "PASS __tests__/a-giraffe.js
   ✓ giraffe"

packages/jest-config/src/readConfigFileAndSetRootDir.ts

@@ -51,7 +51,7 @@ export default async function readConfigFileAndSetRootDir(
               error instanceof SyntaxError &&
               // Likely ESM in a file interpreted as CJS, which means it needs to be
               // compiled. We ignore the error and try to load it with a loader.
-              error.message.match(/Unexpected token '(export|import)'/)
+              /Unexpected token '(export|import)'/.test(error.message)
             )
           ) {
             throw error;