improve: detect Russian ruble currency when the price is prefixed with "RUB"

Author: php-coder

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

@@ -78,7 +78,8 @@ public class SeriesInfoExtractorServiceImpl implements SeriesInfoExtractorServic
 	private static final Pattern BYN_CURRENCY_REGEXP = Pattern.compile("[0-9] бел\\. руб\\.");
 
 	// Regular expression that matches Rubles (Russian currency).
-	private static final Pattern RUB_CURRENCY_REGEXP = Pattern.compile("[0-9][ ]?р(уб|\\.)");
+	// CheckStyle: ignore LineLength for next 1 line
+	private static final Pattern RUB_CURRENCY_REGEXP = Pattern.compile("([0-9][ ]?р(уб|\\.)|RUB [0-9])");
 
 	// Regular expression that matches Ukrainian hryvnia.
 	private static final Pattern UAH_CURRENCY_REGEXP = Pattern.compile("([0-9] |\\b)грн\\b");

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

@@ -716,6 +716,7 @@ class SeriesInfoExtractorServiceImplTest extends Specification {
 			'200руб'    | _
 			'660 руб.'  | _
 			'800 р.'    | _
+			'RUB 1218'  | _
 	}
 
 	@Unroll