diff --git a/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java b/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java
index bd4d8ad78f..d5e0177ec4 100644
--- a/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java
+++ b/hibernate-community-dialects/src/main/java/org/hibernate/community/dialect/InformixDialect.java
@@ -55,6 +55,7 @@ import org.hibernate.query.sqm.mutation.internal.temptable.LocalTemporaryTableIn
 import org.hibernate.query.sqm.mutation.internal.temptable.LocalTemporaryTableMutationStrategy;
 import org.hibernate.query.sqm.mutation.spi.SqmMultiTableInsertStrategy;
 import org.hibernate.query.sqm.mutation.spi.SqmMultiTableMutationStrategy;
+import org.hibernate.query.sqm.produce.function.StandardFunctionArgumentTypeResolvers;
 import org.hibernate.query.sqm.sql.SqmTranslator;
 import org.hibernate.query.sqm.sql.SqmTranslatorFactory;
 import org.hibernate.query.sqm.sql.StandardSqmTranslatorFactory;
@@ -73,6 +74,7 @@ import org.hibernate.tool.schema.extract.spi.SequenceInformationExtractor;
 import org.hibernate.tool.schema.internal.StandardForeignKeyExporter;
 import org.hibernate.tool.schema.spi.Exporter;
 import org.hibernate.type.JavaObjectType;
+import org.hibernate.type.StandardBasicTypes;
 import org.hibernate.type.descriptor.jdbc.ClobJdbcType;
 import org.hibernate.type.descriptor.jdbc.ObjectNullAsBinaryTypeJdbcType;
 import org.hibernate.type.descriptor.jdbc.spi.JdbcTypeRegistry;
@@ -85,6 +87,7 @@ import org.hibernate.type.spi.TypeConfiguration;
 import jakarta.persistence.TemporalType;
 
 import static org.hibernate.exception.spi.TemplatedViolatedConstraintNameExtractor.extractUsingTemplate;
+import static org.hibernate.query.sqm.produce.function.FunctionParameterType.STRING;
 import static org.hibernate.type.SqlTypes.BIGINT;
 import static org.hibernate.type.SqlTypes.BINARY;
 import static org.hibernate.type.SqlTypes.FLOAT;
@@ -315,6 +318,20 @@ public class InformixDialect extends Dialect {
 
 		functionContributions.getFunctionRegistry().register( "least", new CaseLeastGreatestEmulation( true ) );
 		functionContributions.getFunctionRegistry().register( "greatest", new CaseLeastGreatestEmulation( false ) );
+		functionContributions.getFunctionRegistry().namedDescriptorBuilder( "matches" )
+				.setInvariantType( functionContributions.getTypeConfiguration()
+						.getBasicTypeRegistry()
+						.resolve( StandardBasicTypes.STRING )
+				)
+				.setExactArgumentCount( 2 )
+				.setArgumentTypeResolver(
+						StandardFunctionArgumentTypeResolvers.impliedOrInvariant(
+								functionContributions.getTypeConfiguration(),
+								STRING
+						)
+				)
+				.setArgumentListSignature( "(STRING string, STRING length)" )
+				.register();
 		if ( supportsWindowFunctions() ) {
 			functionFactory.windowFunctions();
 		}
diff --git a/hibernate-community-dialects/src/test/java/org/hibernate/community/dialect/InformixFunctionTest.java b/hibernate-community-dialects/src/test/java/org/hibernate/community/dialect/InformixFunctionTest.java
index 91070aaf65..762bf92940 100644
--- a/hibernate-community-dialects/src/test/java/org/hibernate/community/dialect/InformixFunctionTest.java
+++ b/hibernate-community-dialects/src/test/java/org/hibernate/community/dialect/InformixFunctionTest.java
@@ -181,6 +181,23 @@ public class InformixFunctionTest {
 		);
 	}
 
+	@Test
+	@TestForIssue(jiraKey = "HHH-18369")
+	public void testMatches(SessionFactoryScope scope) {
+		scope.inTransaction(
+				(session) -> {
+					String country = (String) session.createQuery(
+									"select e.country " +
+											"from Event e " +
+											"where e.id = :id and matches(e.country, :country) = 'T'" )
+							.setParameter( "id", event.id )
+							.setParameter( "country", "R*" )
+							.getSingleResult();
+					assertEquals( "Romania", country );
+				}
+		);
+	}
+
 	private Calendar todayCalendar() {
 		Calendar calendar = Calendar.getInstance();
 		calendar.set(Calendar.HOUR_OF_DAY, 0);