fix(series import): fix incorrect quantity extraction when a fragment doesn't contain "stamps" word.

Part of #1376

Author: php-coder

src/main/java/ru/mystamps/web/feature/series/importing/SeriesInfoExtractorServiceImpl.java

@@ -63,7 +63,7 @@ public class SeriesInfoExtractorServiceImpl implements SeriesInfoExtractorServic
 	// Regular expression matches number of the stamps in a series.
 	// CheckStyle: ignore LineLength for next 2 lines
 	private static final Pattern NUMBER_OF_STAMPS_REGEXP = Pattern.compile(
-		"(?<quantity>[1-9][0-9]*)(-?(ти|ой|ух))?( ((без)?зубцов(ая|ы[ех])))?(м\\*{0,2}| (мар(ок|к[аи])|(люкс[- ])?блок(а|ов)?|БЛ))",
+		"(?<quantity>[1-9][0-9]*)(-?(ти|ой|ух))?( ((без)?зубцов(ая|ы[ех])))?[ ]?(м(ар(ок|к[аи])|\\b)|(люкс[- ])?блок(а|ов)?|БЛ)",
 		Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE
 	);
 

src/test/groovy/ru/mystamps/web/feature/series/importing/SeriesInfoExtractorServiceImplTest.groovy

@@ -394,6 +394,7 @@ class SeriesInfoExtractorServiceImplTest extends Specification {
 			fragment                                               | _
 			'2 чего-либо'                                          | _
 			'0 марок'                                              | _
+			'№1576-1578=4,2МЕ'                                     | _
 			'Велоцираптор 2003 Блок с/з'                           | _
 			(SeriesValidation.MAX_STAMPS_IN_SERIES + 1) + ' марок' | _
 	}