Before You File a Bug Report Please Confirm You Have Done The Following...

• I have tried restarting my IDE and the issue persists.
• I have updated to the latest version of the packages.
• I have searched for related issues and found none that matched my issue.
• I have read the FAQ and my problem is not listed.

Playground Link

https://typescript-eslint.io/play/#ts=5.3.3&fileType=.ts&code=MYewdgzgLgBFCmAPWBeGByCIC28oAsBLMAc3QG4AoUSWEAIwCsAuGAbxgngEMAnYfKwBK8EgFFEABxgBfKgmQA6bNygCAFA0aKufAQEpyQA&eslintrc=N4KABGBEBOCuA2BTAzpAXGUEKQAIBcBPABxQGNoBLY-AWhXkoDt8B6Y6RAM0Wls4DmiAB7F6wxGXRRe0APbRI4MAF8QKoA&tsconfig=&tokens=false

Repro Code

const text = 'something';
const obj: { search: RegExp };
text.match(obj.search);

ESLint Config

module.exports = {
  "rules": {
    "@typescript-eslint/prefer-regexp-exec": "error"
  }
}

tsconfig

No response

Expected Result

I expected no error to be reported since the regular expression's flags are unknown, and changing this to String#match may change runtime behavior.

Actual Result

An error was reported

Use the RegExp#exec() method instead. 3:6 - 3:11

Additional Info

Related to #3477 (comment)