fix(series import): detect Russian currency when it's written as a single character.

Fix #1236

Author: php-coder

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

@@ -68,7 +68,7 @@ public class SeriesInfoExtractorServiceImpl implements SeriesInfoExtractorServic
 	private static final Pattern PRICE_WITH_SPACES = Pattern.compile("([0-9]) ([0-9])");
 
 	// Regular expression that matches Rubles (Russian currency).
-	private static final Pattern RUB_CURRENCY_REGEXP = Pattern.compile("[0-9][ ]?руб");
+	private static final Pattern RUB_CURRENCY_REGEXP = Pattern.compile("[0-9][ ]?р(уб|\\.)");
 
 	// CheckStyle: ignore LineLength for next 4 lines
 	private static final Pattern VALID_CATEGORY_NAME_EN = Pattern.compile(CategoryValidation.NAME_EN_REGEXP);

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

@@ -671,6 +671,7 @@ class SeriesInfoExtractorServiceImplTest extends Specification {
 			'100 руб'   | _
 			'200руб'    | _
 			'660 руб.'  | _
+			'800 р.'    | _
 	}
 
 }