Search String parser

SearchUtil.java

package org.formium.util;

import java.util.HashMap;
import java.util.Map;
import java.util.StringJoiner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class SearchUtil {
    public static Map<String,String> parseSearchQuery(String query) {
        Pattern p = Pattern.compile("\"[^\"]+\"");
        Matcher m = p.matcher(query);
        StringBuffer sb = new StringBuffer();
        while (m.find()) {
            String key = m.group();
            m.appendReplacement(sb, key.replace(' ', '_').substring(1, key.length()-1));
        }
        m.appendTail(sb);

        Map<String,String> results = new HashMap<>();
        String[] terms = sb.toString().split(" ");
        StringJoiner sj = new StringJoiner(" ");
        for (String term : terms) {
            if (term.indexOf(':') > -1) {
                results.put(term.split(":")[0], term.split(":")[1].replace('_', ' '));
            } else {
                sj.add(term);
            }
        }
        String search = sj.toString().trim();
        if (!search.isEmpty()) {
            results.put("", search);
        }

        return results;
    }
}