fix: exclude trailing whitespace from quoted hex literals

src/main/jjtree/net/sf/jsqlparser/parser/JSqlParserCC.jjt

@@ -2821,7 +2821,8 @@ TOKEN : /* Numeric Constants */
             )>
   |     < S_LONG: ( <DIGIT> )+ >
   |     < #DIGIT: ["0" - "9"] >
-  |     < S_HEX: ("X" ("'" ( <HEX_VALUE> )* "'" (" ")*)+ | "0x" ( <HEX_DIGIT> )+ ) >
+  |     < S_HEX: ("X" <QUOTED_HEX> ( (" ")* <QUOTED_HEX> )* | "0x" ( <HEX_DIGIT> )+ ) >
+  |     < #QUOTED_HEX: "'" ( <HEX_VALUE> )* "'" >
   |     < #HEX_VALUE: ["0"-"9","A"-"F", " "]  >
   |     < #HEX_DIGIT: ["0"-"9","A"-"F"]  >
 }

src/test/java/net/sf/jsqlparser/expression/QuotedHexValueTest.java

@@ -0,0 +1,81 @@
+/*-
+ * #%L
+ * JSQLParser library
+ * %%
+ * Copyright (C) 2004 - 2026 JSQLParser
+ * %%
+ * Dual licensed under GNU LGPL 2.1 or Apache License 2.0
+ * #L%
+ */
+package net.sf.jsqlparser.expression;
+
+import net.sf.jsqlparser.JSQLParserException;
+import net.sf.jsqlparser.parser.AbstractJSqlParser.Dialect;
+import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.statement.select.PlainSelect;
+import net.sf.jsqlparser.test.TestUtils;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.ValueSource;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class QuotedHexValueTest {
+    @ParameterizedTest
+    @ValueSource(strings = {
+            "SELECT X'6162' AS v",
+            "SELECT X'6162'     AS v",
+            "SELECT X'6162' FROM t",
+            "SELECT X'6162' ",
+            "SELECT X'6162'\tAS v",
+            "SELECT X'6162'\nAS v"
+    })
+    void whitespaceIsNotPartOfHexLiteral(String sql) throws JSQLParserException {
+        for (Dialect dialect : new Dialect[] {null, Dialect.MYSQL, Dialect.POSTGRESQL}) {
+            PlainSelect select = (PlainSelect) CCJSqlParserUtil.parse(sql,
+                    parser -> {
+                        if (dialect != null) {
+                            parser.withDialect(dialect);
+                        }
+                    });
+            HexValue hex = (HexValue) select.getSelectItem(0).getExpression();
+            assertEquals("X'6162'", hex.getValue());
+            assertEquals("6162", hex.getDigits());
+            assertEquals(24930L, hex.getLong());
+            assertEquals("ab", hex.getStringValue().getValue());
+            assertEquals("\\x61\\x62", hex.getBlob().getValue());
+            String canonical = select.toString();
+            for (int i = 0; i < 3; i++) {
+                select = (PlainSelect) TestUtils.assertSqlCanBeParsedAndDeparsed(canonical,
+                        false, parser -> {
+                            if (dialect != null) {
+                                parser.withDialect(dialect);
+                            }
+                        });
+                assertEquals(canonical, select.toString());
+            }
+        }
+    }
+
+    @ParameterizedTest
+    @ValueSource(strings = {"X'61 62'", "X'61' '62'", "X'61''62'", "X''", "x'6162'", "0x6162"})
+    void existingHexTokenFormsArePreserved(String literal) throws JSQLParserException {
+        PlainSelect select = (PlainSelect) CCJSqlParserUtil.parse("SELECT " + literal + " AS v");
+        assertEquals(literal, ((HexValue) select.getSelectItem(0).getExpression()).getValue());
+        TestUtils.assertSqlCanBeParsedAndDeparsed(select.toString(), false);
+    }
+
+    @Test
+    void jsonDefaultHexIsAccessibleAndEditable() throws JSQLParserException {
+        String sql = "SELECT JSON_VALUE('{}', '$.v' DEFAULT X'6162' ON EMPTY)";
+        PlainSelect select = (PlainSelect) TestUtils.assertSqlCanBeParsedAndDeparsed(sql, false);
+        JsonFunction function = (JsonFunction) select.getSelectItem(0).getExpression();
+        HexValue hex = (HexValue) function.getOnEmptyBehavior().getExpression();
+        assertEquals("6162", hex.getDigits());
+        assertEquals("ab", hex.getStringValue().getValue());
+        hex.setValue("X'6364'");
+        TestUtils.assertStatementCanBeDeparsedAs(select, sql.replace("6162", "6364"));
+        TestUtils.assertSqlCanBeParsedAndDeparsed(select.toString(), false);
+        assertEquals("cd", hex.getStringValue().getValue());
+    }
+}