Performance of Splitting a Proxy Protocol v1 Header: Pre-compiled Pattern vs Netty StringUtil

PreCompiledRegexVsNettyStringUtil.java

package com.t12y.benchmarks;

import io.netty.util.internal.StringUtil;
import java.util.regex.Pattern;
import org.openjdk.jmh.annotations.GenerateMicroBenchmark;

public class PreCompiledRegexVsNettyStringUtil {
    private static final Pattern SINGLE_SPACE_PATTERN = Pattern.compile(" ");
    private static final String PROXY_PROTOCOL_STRING = "PROXY TCP4 192.168.0.1 192.168.0.11 56324 443";

    @GenerateMicroBenchmark
    public String[] preCompiledRegex() {
        return SINGLE_SPACE_PATTERN.split(PROXY_PROTOCOL_STRING);
    }

    @GenerateMicroBenchmark
    public String[] nettyStringUtil() {
        return StringUtil.split(PROXY_PROTOCOL_STRING, ' ');
    }
}

result.png