Regex Not Capturing Email Addresses with Subdomains in Java - Handling Edge Cases
I'm not sure how to approach I've searched everywhere and can't find a clear answer... I tried several approaches but none seem to work. I'm working on a Java application that needs to validate email addresses, but I'm running into an scenario with correctly capturing email addresses that include subdomains. My current regex pattern is: ```java String emailRegex = "^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$"; ``` While this pattern works for most standard email formats, it's failing to match emails like `user@sub.example.com`. When testing with this email, the `Pattern.matches(emailRegex, email)` method returns `false`, which is not what I expect. I've tried modifying the regex to allow for subdomains by changing the pattern to: ```java String emailRegex = "^[a-zA-Z0-9._%+-]+@([a-zA-Z0-9-]+\.)+[a-zA-Z]{2,}$"; ``` However, this pattern still does not seem to work correctly. When I test it against a list of email addresses, it fails on valid ones that include subdomains while capturing some invalid ones. I also checked the Java version I am using, which is OpenJDK 11.0.10, to make sure it's not a version scenario with regex handling. I need a regex that captures all valid email formats, including those with multiple subdomains, but does not allow for invalid formats like `user@-example.com` or `user@example..com`. Can anyone suggest a more reliable regex pattern or point out what I might be doing wrong? Am I missing something obvious? Any ideas how to fix this? I'm working in a Linux environment.