improve: extract a quantity from blocks when they are abbreviated.

Fix #1298

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)?)",
+		"(?<quantity>[1-9][0-9]{0,2})(-?(ти|ой|ух))?( ((без)?зубцов(ая|ы[ех])))? (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

@@ -413,6 +413,7 @@ class SeriesInfoExtractorServiceImplTest extends Specification {
 			'1 блок'               || 1
 			'4 блока'              || 4
 			'6 блоков'             || 6
+			'6 БЛ'                 || 6
 			'6 зубцовых блоков'    || 6
 			'серия из 5-ти марок'  || 5
 			'серия из 21-ой марки' || 21