👀 Views: 77 💬 Answers: 1 📅 Created: 2025-06-03

regex java iso8601 Java

I'm trying to configure I've looked through the documentation and I'm still confused about I'm trying to validate ISO 8601 date strings in a Java application, but my regex isn't capturing the timezone offsets correctly. The format I'm aiming for is: `YYYY-MM-DDTHH:mm:ssZ` or `YYYY-MM-DDTHH:mm:ss±HH:mm`. I wrote the following regex: ```java String iso8601Regex = "^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}([+-]\d{2}:\d{2}|Z)$"; ``` However, the pattern seems to fail for dates with the Z or the timezone offset. For example, it correctly matches `2023-10-15T13:45:30Z`, but when I test it with `2023-10-15T13:45:30+02:00`, it doesn't match. I've tried modifying the regex to accommodate the timezone offsets by changing the capture group to: ```java String iso8601Regex = "^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}Z|([+-]\d{2}:\d{2})$"; ``` However, this still isn't working. The regex doesn't recognize `+02:00` as valid. I've also attempted to include optional spaces, but it seems to make things messier. I want to ensure that my regex is robust enough to handle diverse ISO 8601 formats without being overly complex. Any suggestions or corrections for my regex? I'm using Java 11, and I'm testing with the following code: ```java String[] testDates = { "2023-10-15T13:45:30Z", "2023-10-15T13:45:30+02:00", "2023-10-15T13:45:30-05:00", "2023-10-15T13:45:30" }; for (String date : testDates) { System.out.println(date + " matches: " + date.matches(iso8601Regex)); } ``` When I run this, I see that only the UTC date matches, which is not the expected outcome. I'm looking for a solution that accurately validates both with and without timezone information. Any help would be greatly appreciated! I'm working on a CLI tool that needs to handle this. What am I doing wrong? I'm coming from a different tech stack and learning Java. I'm open to any suggestions.