Fix PathPattern comparator result for wildcard suffix usage

Without this change the comparator thinks "/{foo}"
is more specific than "/{foo}.*". The minimal fix here
to address it is to copy what the AntPathMatcher
comparator does which is to consider '.*' as *not*
a usage of a wildcard. See PatternInfo#initCounters()
for the AntPathMatcher handling of this.

This change ensures the PathPattern comparator now produces
the expected result but suffix usage in general needs more
thought at some point.

Issue: SPR-15597

spring-web/src/main/java/org/springframework/web/util/pattern/RegexPathElement.java

@@ -72,8 +72,13 @@ class RegexPathElement extends PathElement {
 			}
 			else if ("*".equals(match)) {
 				patternBuilder.append(".*");
+				int pos = matcher.start();
+				if (pos < 1 || text.charAt(pos-1) != '.') {
+					// To be compatible with the AntPathMatcher comparator, 
+					// '.*' is not considered a wildcard usage
 					this.wildcardCount++;
 				}
+			}
 			else if (match.startsWith("{") && match.endsWith("}")) {
 				int colonIdx = match.indexOf(':');
 				if (colonIdx == -1) {

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

@@ -23,6 +23,7 @@ import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 
+import org.hamcrest.Matchers;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
@@ -1053,6 +1054,25 @@ public class PathPatternMatcherTests {
 		assertEquals(1, comparator.compare(parse("*/**"), parse("*")));
 	}
 	
+	@Test
+	public void compare_spr15597() {
+		PathPatternParser parser = new PathPatternParser();
+		PathPattern p1 = parser.parse("/{foo}");
+		PathPattern p2 = parser.parse("/{foo}.*");
+		Map<String, String> r1 = p1.matchAndExtract("/file.txt");
+		Map<String, String> r2 = p2.matchAndExtract("/file.txt");
+		 
+		// works fine
+		assertEquals(r1.get("foo"), "file.txt");
+		assertEquals(r2.get("foo"), "file");
+
+		// This produces 2 (see comments in https://jira.spring.io/browse/SPR-14544 )
+		// Comparator<String> patternComparator = new AntPathMatcher().getPatternComparator("");
+		// System.out.println(patternComparator.compare("/{foo}","/{foo}.*"));
+
+		assertThat(p1.compareTo(p2), Matchers.greaterThan(0));
+	}
+
 	@Test
 	public void patternCompareTo() {
 		PathPatternParser p = new PathPatternParser();