Fix: Ignore "Math superscript (^) and subscript (_) characters are not allowed in text mode" error for citation key (#11948)

CHANGELOG.md

@@ -20,6 +20,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We fixed an issue where a bib file with UFF-8 charset was wrongly loaded with a different charset [forum#5369](https://discourse.jabref.org/t/jabref-5-15-opens-bib-files-with-shift-jis-encoding-instead-of-utf-8/5369/)
 - We fixed an issue where new entries were inserted in the middle of the table instead of at the end. [#12371](https://github.com/JabRef/jabref/pull/12371)
 - We fixed an issue where removing the sort from the table did not restore the original order. [#12371](https://github.com/JabRef/jabref/pull/12371)
+- We fixed an issue where citation keys containing superscript (`^`) and subscript (`_`) characters in text mode were incorrectly flagged by the integrity checker. [#11948](https://github.com/JabRef/jabref/issues/11948)
 
 ### Removed
 

src/main/java/org/jabref/logic/integrity/LatexIntegrityChecker.java

@@ -16,6 +16,7 @@
 import org.jabref.model.entry.field.Field;
 import org.jabref.model.entry.field.FieldFactory;
 
+import org.jabref.model.entry.field.InternalField;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import uk.ac.ed.ph.snuggletex.ErrorCode;
@@ -62,6 +63,8 @@ public class LatexIntegrityChecker implements EntryChecker {
     @Override
     public List<IntegrityMessage> check(BibEntry entry) {
         return entry.getFieldMap().entrySet().stream()
+                    // Ignore checks for the citation key field
+                    .filter(field -> !(field.getKey().equals(InternalField.KEY_FIELD) && field.getValue().matches(".*[\\^_].*")))
                     .filter(field -> FieldFactory.isLatexField(field.getKey()))
                     .flatMap(LatexIntegrityChecker::getUnescapedAmpersandsWithCount)
                     // Exclude all DOM building errors as this functionality is not used.

src/test/java/org/jabref/logic/integrity/LatexIntegrityCheckerTest.java

@@ -300,10 +300,18 @@ private static Stream<Arguments> provideUnacceptedInputs() {
                 Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TFEM03), StandardField.TITLE, "$\\right)$"),
 
                 // TFEM04: \left had no following \right
-                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TFEM04), StandardField.TITLE, "$\\left($")
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TFEM04), StandardField.TITLE, "$\\left($"),
 
                 // TFETB0: \hline must be the only token in table row
                 // Skipped
+
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.TITLE, "Title with ^ and _ characters"),
+                // Ensure invalid LaTeX syntax with special characters in other fields is detected
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.AUTHOR, "Author_Name"),
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.JOURNAL, "Journal_Name"),
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.BOOKTITLE, "Book^Title"),
+                Arguments.of(LatexIntegrityChecker.errorMessageFormatHelper(CoreErrorCode.TTEM03), StandardField.NOTE, "Note_with_subscript_and_superscript^_")
+
         );
     }
 }