Small regex refactor

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/filter/factory/RewritePathGatewayFilterFactory.java

@@ -18,6 +18,7 @@ package org.springframework.cloud.gateway.filter.factory;
 
 import java.util.Arrays;
 import java.util.List;
+import java.util.regex.Pattern;
 
 import reactor.core.publisher.Mono;
 
@@ -59,13 +60,14 @@ public class RewritePathGatewayFilterFactory
 	@Override
 	public GatewayFilter apply(Config config) {
 		String replacement = config.replacement.replace("$\\", "$");
+		Pattern pattern = Pattern.compile(config.regexp);
 		return new GatewayFilter() {
 			@Override
 			public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
 				ServerHttpRequest req = exchange.getRequest();
 				addOriginalRequestUrl(exchange, req.getURI());
 				String path = req.getURI().getRawPath();
-				String newPath = path.replaceAll(config.regexp, replacement);
+				String newPath = pattern.matcher(path).replaceAll(replacement);
 
 				ServerHttpRequest request = req.mutate().path(newPath).build();
 

spring-cloud-gateway-server/src/main/java/org/springframework/cloud/gateway/handler/predicate/HeaderRoutePredicateFactory.java

@@ -20,10 +20,11 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
 import java.util.function.Predicate;
+import java.util.regex.Pattern;
 
 import jakarta.validation.constraints.NotEmpty;
 
-import org.springframework.util.ObjectUtils;
+import org.springframework.util.StringUtils;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.server.ServerWebExchange;
 
@@ -53,7 +54,7 @@ public class HeaderRoutePredicateFactory extends AbstractRoutePredicateFactory<H
 
 	@Override
 	public Predicate<ServerWebExchange> apply(Config config) {
-		boolean hasRegex = !ObjectUtils.isEmpty(config.regexp);
+		Pattern pattern = (StringUtils.hasText(config.regexp)) ? Pattern.compile(config.regexp) : null;
 
 		return new GatewayPredicate() {
 			@Override
@@ -64,11 +65,11 @@ public class HeaderRoutePredicateFactory extends AbstractRoutePredicateFactory<H
 					return false;
 				}
 				// values is now guaranteed to not be empty
-				if (hasRegex) {
+				if (pattern != null) {
 					// check if a header value matches
 					for (int i = 0; i < values.size(); i++) {
 						String value = values.get(i);
-						if (value.matches(config.regexp)) {
+						if (pattern.asMatchPredicate().test(value)) {
 							return true;
 						}
 					}