improve: extract quantity when it's immediately followed by a shortened "a stamp" word.

Fix #1300

Author: php-coder

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

@@ -61,7 +61,7 @@ public class SeriesInfoExtractorServiceImpl implements SeriesInfoExtractorServic
 	// Regular expression matches number of the stamps in a series (from 1 to 999).
 	// CheckStyle: ignore LineLength for next 2 lines
 	private static final Pattern NUMBER_OF_STAMPS_REGEXP = Pattern.compile(
-		"(?<quantity>[1-9][0-9]{0,2})(-?(ти|ой|ух))?( ((без)?зубцов(ая|ы[ех])))? (мар(ок|к[аи])|блок(а|ов)?|БЛ)",
+		"(?<quantity>[1-9][0-9]{0,2})(-?(ти|ой|ух))?( ((без)?зубцов(ая|ы[ех])))?(м\\*{0,2}|( (мар(ок|к[аи])|блок(а|ов)?|БЛ)?))",
 		Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE
 	);
 

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

@@ -402,7 +402,10 @@ class SeriesInfoExtractorServiceImplTest extends Specification {
 			service.extractQuantity(fragment) == expectedQuantity
 		where:
 			fragment               || expectedQuantity
+			'3м'                   ||  3
+			'3м**'                 ||  3
 			'1 марка'              ||  1
+			'5марок'               ||  5
 			'5 марок'              ||  5
 			'5 МАРОК'              ||  5
 			'22 марки'             || 22