Java Regex pattern that matches in any online tester but doesn’t in Eclipse

When using matches(), you are asking if the string you provided matches your regex as a whole. It is as if you added ^ at the beginning of your regex and $ at the end.

Your regex is otherwise fine, and returns what you expect. I recommend testing it regexplanet.com, Java mode. You will see when matches() is true, when it false, and what each find() will return.

To solve your problem, I think you only need to remove the if (matcher.matches()) condition.

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