SPR-7787 Allow qualifiers in regular expressions of URI template patterns.

org.springframework.core/src/main/java/org/springframework/util/AntPathStringMatcher.java

@@ -24,17 +24,18 @@ import java.util.regex.Pattern;
 
 /**
  * Package-protected helper class for {@link AntPathMatcher}. Tests whether or not a string matches against a pattern
- * using a regular expression.
+ * via a {@link Pattern}.
  *
  * <p>The pattern may contain special characters: '*' means zero or more characters; '?' means one and only one
- * character; '{' and '}' indicate a URI template pattern.
+ * character; '{' and '}' indicate a URI template pattern. For example <tt>/users/{user}</tt>.
  *
  * @author Arjen Poutsma
+ * @author Rossen Stoyanchev
  * @since 3.0
  */
 class AntPathStringMatcher {
 
-	private static final Pattern GLOB_PATTERN = Pattern.compile("\\?|\\*|\\{([^/]+?)\\}");
+	private static final Pattern GLOB_PATTERN = Pattern.compile("\\?|\\*|\\{((?:\\{[^/]+?\\}|[^/{}]|\\\\[{}])+?)\\}");
 
 	private static final String DEFAULT_VARIABLE_PATTERN = "(.*)";
 
@@ -103,6 +104,11 @@ class AntPathStringMatcher {
 		Matcher matcher = pattern.matcher(str);
 		if (matcher.matches()) {
 			if (uriTemplateVariables != null) {
+				// SPR-8455
+				Assert.isTrue(variableNames.size() == matcher.groupCount(), 
+						"The number of capturing groups in the pattern segment " + pattern + 
+						" does not match the number of URI template variables it defines, which can occur if " + 
+						" capturing groups are used in a URI template regex. Use non-capturing groups instead.");
 				for (int i = 1; i <= matcher.groupCount(); i++) {
 					String name = this.variableNames.get(i - 1);
 					String value = matcher.group(i);

org.springframework.core/src/test/java/org/springframework/util/AntPathMatcherTests.java

@@ -32,6 +32,7 @@ import org.junit.Test;
  * @author Seth Ladd
  * @author Juergen Hoeller
  * @author Arjen Poutsma
+ * @author Rossen Stoyanchev
  */
 public class AntPathMatcherTests {
 
@@ -335,7 +336,7 @@ public class AntPathMatcherTests {
 	}
 
 	@Test
-	public void extractUriTemplateVariablesCustomRegex() {
+	public void extractUriTemplateVariablesRegex() {
 		Map<String, String> result = pathMatcher
 				.extractUriTemplateVariables("{symbolicName:[\\w\\.]+}-{version:[\\w\\.]+}.jar",
 						"com.example-1.0.0.jar");
@@ -348,6 +349,45 @@ public class AntPathMatcherTests {
 		assertEquals("1.0.0", result.get("version"));
 	}
 	
+	// SPR-7787
+	
+	@Test
+	public void extractUriTemplateVarsRegexQualifiers() {
+		Map<String, String> result = pathMatcher.extractUriTemplateVariables(
+				"{symbolicName:[\\p{L}\\.]+}-sources-{version:[\\p{N}\\.]+}.jar", 
+				"com.example-sources-1.0.0.jar");
+		assertEquals("com.example", result.get("symbolicName"));
+		assertEquals("1.0.0", result.get("version"));
+
+		result = pathMatcher.extractUriTemplateVariables(
+				"{symbolicName:[\\w\\.]+}-sources-{version:[\\d\\.]+}-{year:\\d{4}}{month:\\d{2}}{day:\\d{2}}.jar",
+				"com.example-sources-1.0.0-20100220.jar");
+		assertEquals("com.example", result.get("symbolicName"));
+		assertEquals("1.0.0", result.get("version"));
+		assertEquals("2010", result.get("year"));
+		assertEquals("02", result.get("month"));
+		assertEquals("20", result.get("day"));
+
+		result = pathMatcher.extractUriTemplateVariables(
+				"{symbolicName:[\\p{L}\\.]+}-sources-{version:[\\p{N}\\.\\{\\}]+}.jar",
+				"com.example-sources-1.0.0.{12}.jar");
+		assertEquals("com.example", result.get("symbolicName"));
+		assertEquals("1.0.0.{12}", result.get("version"));
+	}
+
+	// SPR-8455
+	
+	@Test
+	public void extractUriTemplateVarsRegexCapturingGroups() {
+		try {
+			pathMatcher.extractUriTemplateVariables("/web/{id:foo(bar)?}", "/web/foobar");
+			fail("Expected exception");
+		} catch (IllegalArgumentException e) {
+			assertTrue("Expected helpful message on the use of capturing groups", 
+					e.getMessage().contains("The number of capturing groups in the pattern"));
+		}
+	}
+	
 	@Test
 	public void combine() {
 		assertEquals("", pathMatcher.combine(null, null));