Improve Automatic Field Editor Dialog

src/main/java/org/jabref/gui/edit/automaticfiededitor/copyormovecontent/CopyOrMoveFieldContentTabViewModel.java

@@ -49,7 +49,7 @@ public CopyOrMoveFieldContentTabViewModel(List<BibEntry> selectedEntries, BibDat
         toFieldValidator = new FunctionBasedValidator<>(toField, field -> {
             if (StringUtil.isBlank(field.getName())) {
                 return ValidationMessage.error("Field name cannot be empty");
-            } else if (StringUtil.containsAnyWhitespaceCharacters(field.getName())) {
+            } else if (StringUtil.containsWhitespace(field.getName())) {
                 return ValidationMessage.error("Field name cannot have whitespace characters");
             }
             return null;

src/main/java/org/jabref/gui/edit/automaticfiededitor/editfieldcontent/EditFieldContentViewModel.java

@@ -52,7 +52,7 @@ public EditFieldContentViewModel(BibDatabase database, List<BibEntry> selectedEn
         fieldValidator = new FunctionBasedValidator<>(selectedField, field -> {
             if (StringUtil.isBlank(field.getName())) {
                 return ValidationMessage.error("Field name cannot be empty");
-            } else if (StringUtil.containsAnyWhitespaceCharacters(field.getName())) {
+            } else if (StringUtil.containsWhitespace(field.getName())) {
                 return ValidationMessage.error("Field name cannot have whitespace characters");
             }
             return null;

src/main/java/org/jabref/gui/edit/automaticfiededitor/renamefield/RenameFieldViewModel.java

@@ -48,7 +48,7 @@ public RenameFieldViewModel(List<BibEntry> selectedEntries, BibDatabase database
         fieldNameValidator = new FunctionBasedValidator<>(newFieldName, fieldName -> {
             if (StringUtil.isBlank(fieldName)) {
                 return ValidationMessage.error("Field name cannot be empty");
-            } else if (StringUtil.containsAnyWhitespaceCharacters(fieldName)) {
+            } else if (StringUtil.containsWhitespace(fieldName)) {
                 return ValidationMessage.error("Field name cannot have whitespace characters");
             }
             return null;

src/main/java/org/jabref/model/strings/StringUtil.java

@@ -758,7 +758,7 @@ public static String quoteStringIfSpaceIsContained(String string) {
      * @param s The string to check
      * @return {@code True} if the given string does contain at least one whitespace character, {@code False} otherwise
      * */
-    public static boolean containsAnyWhitespaceCharacters(String s) {
-        return s.matches(".*\s.*");
+    public static boolean containsWhitespace(String s) {
+        return s.chars().anyMatch(Character::isWhitespace);
     }
 }

src/test/java/org/jabref/model/strings/StringUtilTest.java

@@ -386,4 +386,20 @@ void testStripAccents() {
         assertEquals("aAoeee", StringUtil.stripAccents("åÄöéèë"));
         assertEquals("Muhlbach", StringUtil.stripAccents("Mühlbach"));
     }
+
+    @Test
+    void testContainsWhitespace() {
+        assertTrue(StringUtil.containsWhitespace("file url"));
+        assertTrue(StringUtil.containsWhitespace("file\nurl"));
+        assertTrue(StringUtil.containsWhitespace("file\r\nurl"));
+        assertTrue(StringUtil.containsWhitespace("file\rurl"));
+        assertTrue(StringUtil.containsWhitespace("file\furl"));
+        assertTrue(StringUtil.containsWhitespace("file_url "));
+        assertTrue(StringUtil.containsWhitespace("file url\n"));
+        assertTrue(StringUtil.containsWhitespace(" "));
+
+        assertFalse(StringUtil.containsWhitespace("file_url"));
+        assertFalse(StringUtil.containsWhitespace("PascalCase"));
+        assertFalse(StringUtil.containsWhitespace(""));
+    }
 }