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  1. import java.util.*;
  2. import java.util.regex.Pattern;
  3. import java.time.*;
  4. import java.time.format.*;
  5. import java.time.temporal.ChronoField;
  6.  
  7. class Ideone
  8. {
  9.     private static final Locale RU = Locale.forLanguageTag("ru-RU");
  10.     private static final Pattern MONTH_PATTERN
  11.             = Pattern.compile("^\\d+ (\\w{3,5})\\.? \\d+$", Pattern.UNICODE_CHARACTER_CLASS);
  12.     private static final Pattern NO_MONTH_PATTERN
  13.             = Pattern.compile("^(\\d+) \\w{3,5}\\.? (\\d+)$", Pattern.UNICODE_CHARACTER_CLASS);
  14.  
  15.     public static LocalDate parseSloppyRussianDate(String dateString) {
  16.         String monthAbbr = MONTH_PATTERN.matcher(dateString).replaceFirst("$1");
  17.         Month month = Arrays.stream(Month.values())
  18.                 .filter(m -> m.getDisplayName(TextStyle.FULL, RU).startsWith(monthAbbr))
  19.                 .findAny()
  20.                 .orElseThrow(() -> new DateTimeParseException("Unknown month", dateString, 3));
  21.  
  22.         String withoutMonth = NO_MONTH_PATTERN.matcher(dateString).replaceFirst("$1 $2");
  23.  
  24.         DateTimeFormatter dtf = new DateTimeFormatterBuilder()
  25.                 .appendPattern("d u")
  26.                 .parseDefaulting(ChronoField.MONTH_OF_YEAR, month.getValue())
  27.                 .toFormatter(RU);
  28.  
  29.         return LocalDate.parse(withoutMonth, dtf);
  30.     }
  31.  
  32. 	public static void main (String[] args) throws java.lang.Exception
  33. 	{
  34.         System.out.println(parseSloppyRussianDate("27 апр. 2018"));
  35.         System.out.println(parseSloppyRussianDate("24 мая. 2013"));
  36.         System.out.println(parseSloppyRussianDate("28 фев. 2019"));
  37. 	}
  38.  
  39. }
Success #stdin #stdout 0.28s 55396KB
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2018-04-27
2013-05-24
2019-02-28
https://ideone.com/96VjJj
language:
Java (HotSpot 12)
created:
3 years ago
visibility:
secret

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