PathPatternRouteMatcher should use custom separator

Prior to this commit, the `PathPatternRouteMatcher` would always use the
default path pattern separator when parsing incoming route strings to
`RouteMatcher.Route` instances.
When the `PathPatternRouteMatcher` is configured with a
`PathPatternParser` that has a custom separator (e.g., `.`), then the
matching algorithm can't match routes against parsed patterns.

This commit ensures that the route matcher uses the configured separator
at all times.

Fixes gh-23167

spring-web/src/test/java/org/springframework/web/util/pattern/PathPatternRouteMatcherTest.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2002-2019 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.web.util.pattern;
+
+import org.junit.Test;
+
+import org.springframework.util.RouteMatcher;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+
+/**
+ * Tests for the {@link PathPatternRouteMatcher}
+ * @author Brian Clozel
+ */
+public class PathPatternRouteMatcherTest {
+
+	PathPatternRouteMatcher routeMatcher = new PathPatternRouteMatcher(new PathPatternParser());
+
+	@Test
+	public void matchRoute() {
+		RouteMatcher.Route route = routeMatcher.parseRoute("/projects/spring-framework");
+		assertThat(routeMatcher.match("/projects/{name}", route)).isTrue();
+	}
+
+	@Test
+	public void matchRouteCustomSeparator() {
+		PathPatternParser pathPatternParser = new PathPatternParser();
+		pathPatternParser.setSeparator('.');
+		PathPatternRouteMatcher routeMatcher = new PathPatternRouteMatcher(pathPatternParser);
+		RouteMatcher.Route route = routeMatcher.parseRoute("projects.spring-framework");
+		assertThat(routeMatcher.match("projects.{name}", route)).isTrue();
+	}
+
+}