Java String.matches给出了错误的结果

Question

I am using String.matches to search a pattern which is present in my input string, but I am getting wrong result. Below is my code.

public class Main {

    public static void main(String[] args) {
        String text =
                "WHERE  ( d.day_key = fact.day_key  \n" +
                    "AND d.full_date BETWEEN  '2013-10-01' AND '2013-12-05' \n" +
                    "AND advac.account_key = fact.advertiser_account_key  \n" +
                    "AND cam.campaign_key = fact.campaign_key  \n" +
                    "AND advac.account_name = 'abc.com') \n";

System.out.println(text.matches("(.*)full_date(.*)"));

    }

}

The above code prints false. Is there anything wrong with my regex? Please advice.

Answer 1

You need to enable dotall mode if you want . to also match new line characters. This can for example be done like this:

text.matches("(?s)(.*)full_date(.*)");

You can read more in the JavaDocs .

Answer 2

问题是您的输入包含换行符，因此您需要在正则表达式中传递右侧标志，否则点元字符将不匹配：

text.matches("(?s)(.*)full_date(.*)")