Support two argument form of \abx@aux@cite macro in DefaultAuxParser

CHANGELOG.md

@@ -25,6 +25,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 - We fixed an issue where "Copy DOI url" in the right-click menu of the Entry List would just copy the DOI and not the DOI url. [#8389](https://github.com/JabRef/jabref/issues/8389)
 - We fixed an issue where opening the console from the drop-down menu would cause an exception. [#8466](https://github.com/JabRef/jabref/issues/8466)
 - We fixed an issue where pasting a URL was replacing + signs by spaces making the URL unreachable. [#8448](https://github.com/JabRef/jabref/issues/8448)
+- We fixed an issue where creating subsidiary files from aux files created with some versions of biblatex would produce incorrect results. [#8513](https://github.com/JabRef/jabref/issues/8513)
 
 ### Removed
 

src/main/java/org/jabref/logic/auxparser/DefaultAuxParser.java

@@ -32,7 +32,7 @@
 public class DefaultAuxParser implements AuxParser {
     private static final Logger LOGGER = LoggerFactory.getLogger(DefaultAuxParser.class);
 
-    private static final Pattern CITE_PATTERN = Pattern.compile("\\\\(citation|abx@aux@cite)\\{(.+)\\}");
+    private static final Pattern CITE_PATTERN = Pattern.compile("\\\\(citation|abx@aux@cite)(\\{\\d+\\})?\\{(?<citationkey>.+)\\}");
     private static final Pattern INPUT_PATTERN = Pattern.compile("\\\\@input\\{(.+)\\}");
 
     private final BibDatabase masterDatabase;
@@ -108,7 +108,7 @@ private void matchCitation(AuxParserResult result, String line) {
         Matcher citeMatch = CITE_PATTERN.matcher(line);
 
         while (citeMatch.find()) {
-            String keyString = citeMatch.group(2);
+            String keyString = citeMatch.group("citationkey");
             String[] keys = keyString.split(",");
 
             for (String key : keys) {

src/test/java/org/jabref/logic/auxparser/AuxParserTest.java

@@ -64,6 +64,33 @@ void testNormal() throws URISyntaxException, IOException {
         }
     }
 
+    @Test
+    void testTwoArgMacro() throws URISyntaxException, IOException {
+        // Result should be identical to that of testNormal
+
+        InputStream originalStream = AuxParserTest.class.getResourceAsStream("origin.bib");
+        Path auxFile = Path.of(AuxParserTest.class.getResource("papertwoargmacro.aux").toURI());
+        try (InputStreamReader originalReader = new InputStreamReader(originalStream, StandardCharsets.UTF_8)) {
+            ParserResult result = new BibtexParser(importFormatPreferences, new DummyFileUpdateMonitor()).parse(originalReader);
+
+            AuxParser auxParser = new DefaultAuxParser(result.getDatabase());
+            AuxParserResult auxResult = auxParser.parse(auxFile);
+
+            assertTrue(auxResult.getGeneratedBibDatabase().hasEntries());
+            assertEquals(0, auxResult.getUnresolvedKeysCount());
+            BibDatabase newDB = auxResult.getGeneratedBibDatabase();
+            List<BibEntry> newEntries = newDB.getEntries();
+            assertEquals(2, newEntries.size());
+            assertTrue(newEntries.get(0).hasChanged());
+            assertTrue(newEntries.get(1).hasChanged());
+            assertEquals(2, auxResult.getResolvedKeysCount());
+            assertEquals(2, auxResult.getFoundKeysInAux());
+            assertEquals(auxResult.getFoundKeysInAux() + auxResult.getCrossRefEntriesCount(),
+                    auxResult.getResolvedKeysCount() + auxResult.getUnresolvedKeysCount());
+            assertEquals(0, auxResult.getCrossRefEntriesCount());
+        }
+    }
+
     @Test
     void testNotAllFound() throws URISyntaxException, IOException {
         InputStream originalStream = AuxParserTest.class.getResourceAsStream("origin.bib");

src/test/resources/org/jabref/logic/auxparser/papertwoargmacro.aux

@@ -0,0 +1,8 @@
+\relax
+\abx@aux@cite{0}{Darwin1888}
+\abx@aux@cite{0}{Einstein1920}
+\bibstyle{plain}
+\bibdata{origin}
+\bibcite{Darwin1888}{1}
+\bibcite{Einstein1920}{2}
+\@writefile{toc}{\contentsline {section}{\numberline {1}}{1}}