Override toString() in all RequestMatcher

It makes it easier to debug having custom
toString().

Fixes: gh-5446

web/src/main/java/org/springframework/security/web/servlet/util/matcher/MvcRequestMatcher.java

@@ -123,6 +123,24 @@ public class MvcRequestMatcher implements RequestMatcher, RequestVariablesExtrac
 		return this.servletPath;
 	}
 
+	@Override
+	public String toString() {
+		StringBuilder sb = new StringBuilder();
+		sb.append("Mvc [pattern='").append(this.pattern).append("'");
+
+		if (this.servletPath != null) {
+			sb.append(", servletPath='").append(this.servletPath).append("'");
+		}
+
+		if (this.method != null) {
+			sb.append(", ").append(this.method);
+		}
+
+		sb.append("]");
+
+		return sb.toString();
+	}
+
 	private class DefaultMatcher implements RequestMatcher, RequestVariablesExtractor {
 
 		private final UrlPathHelper pathHelper = new UrlPathHelper();

web/src/main/java/org/springframework/security/web/util/matcher/AnyRequestMatcher.java

@@ -44,6 +44,11 @@ public final class AnyRequestMatcher implements RequestMatcher {
 		return 1;
 	}
 
+	@Override
+	public String toString() {
+		return "any request";
+	}
+
 	private AnyRequestMatcher() {
 	}
 }

web/src/main/java/org/springframework/security/web/util/matcher/ELRequestMatcher.java

@@ -65,4 +65,11 @@ public class ELRequestMatcher implements RequestMatcher {
 		return new StandardEvaluationContext(new ELRequestMatcherContext(request));
 	}
 
+	@Override
+	public String toString() {
+		StringBuilder sb = new StringBuilder();
+		sb.append("EL [el=\"").append(this.expression.getExpressionString()).append("\"");
+		sb.append("]");
+		return sb.toString();
+	}
 }

web/src/main/java/org/springframework/security/web/util/matcher/RegexRequestMatcher.java

@@ -130,4 +130,18 @@ public final class RegexRequestMatcher implements RequestMatcher {
 
 		return null;
 	}
+
+	@Override
+	public String toString() {
+		StringBuilder sb = new StringBuilder();
+		sb.append("Regex [pattern='").append(this.pattern).append("'");
+
+		if (this.httpMethod != null) {
+			sb.append(", ").append(this.httpMethod);
+		}
+
+		sb.append("]");
+
+		return sb.toString();
+	}
 }