[Cleaning] updated cleaning rule for DOIs

dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/clean/CleaningFunctions.java

@@ -15,7 +15,7 @@ import eu.dnetlib.dhp.schema.oaf.*;
 
 public class CleaningFunctions {
 
-	public static final String DOI_URL_PREFIX_REGEX = "(^http(s?):\\/\\/)(((dx\\.)?doi\\.org)|(handle\\.test\\.datacite\\.org))\\/";
+	public static final String DOI_PREFIX_REGEX = "^10\\.";
 
 	public static final String ORCID_CLEANING_REGEX = ".*([0-9]{4}).*[-–—−=].*([0-9]{4}).*[-–—−=].*([0-9]{4}).*[-–—−=].*([0-9x]{4})";
 	public static final int ORCID_LEN = 19;
@@ -308,7 +308,7 @@ public class CleaningFunctions {
 
 			// TODO add cleaning for more PID types as needed
 			case "doi":
-				pid.setValue(value.toLowerCase().replaceAll(DOI_URL_PREFIX_REGEX, ""));
+				pid.setValue(value.toLowerCase().replaceAll(DOI_PREFIX_REGEX, "10."));
 				break;
 		}
 		return pid;