Hello,

When validating a date format (rule FS_BAD_DATE_FORMAT_FLAG_COMBO), non-interpreted texts seems to be taken into account by the validator.

Example :

The following code :

import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Locale;

public class TestDateFormat {

    public String testDateFormat() {
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("d MMMM yyyy à HH'h'mm", Locale.FRENCH);
        return ZonedDateTime.now(ZoneId.systemDefault()).format(formatter);
    }
}

generate the following error :

[ERROR] Medium: The 'd MMMM yyyy à HH'h'mm' date format string may lead to unexpected behavior used in testDateFormat() At TestDateFormat.java:[line XX] FS_BAD_DATE_FORMAT_FLAG_COMBO

Without the non-interpreted text 'h', no errors are reported.

Reproduced with spotbugs-maven-plugin version 4.9.3.0.

Best regards.