Edition should not start capitalize letter

CHANGELOG.md

@@ -10,6 +10,7 @@ Note that this project **does not** adhere to [Semantic Versioning](http://semve
 ### Added
 
 - We added support for searching ShortScience for an entry through the user's browser. [#6018](https://github.com/JabRef/jabref/pull/6018)
+- We updated EditionChecker  to permit edition to start with a number.
 - We added tooltips for most fields in the entry editor containing a short description. [#5847](https://github.com/JabRef/jabref/issues/5847)
 
 ### Changed

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

@@ -53,6 +53,7 @@ public Optional<String> checkValue(String value) {
 
         //BibTeX
         if (!bibDatabaseContextEdition.isBiblatexMode()) {
+           if(!isFirstCharDigit(value))
             if (!allowIntegerEdition) {
                 if (!FIRST_LETTER_CAPITALIZED.test(value.trim())) {
                     return Optional.of(Localization.lang("should have the first letter capitalized"));
@@ -66,4 +67,9 @@ public Optional<String> checkValue(String value) {
 
         return Optional.empty();
     }
+    boolean isFirstCharDigit (String input){
+        char[] array = input.toCharArray();
+        return Character.isDigit(array[0]);
+
+    }
 }

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

@@ -0,0 +1,23 @@
+package org.jabref.logic.integrity;
+
+import org.jabref.model.database.BibDatabaseContext;
+import org.junit.jupiter.api.Test;
+
+
+
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+
+public class EditionCheckerTest {
+     boolean allowIntegerEdition;
+
+    @Test
+    void isFirstCharacterANumber(){
+        var bibDatabaseContextEdition=new BibDatabaseContext();
+        var editionChecker=new EditionChecker(bibDatabaseContextEdition,allowIntegerEdition);
+        var stringWithNumber="0HelloWorld";
+        boolean flag=editionChecker.isFirstCharDigit(stringWithNumber);
+        assertTrue(flag,"check for true");
+
+    }
+}