code: /* LanguageTool, a natural language style checker
   * Copyright (C) 2019 Daniel Naber (http://www.danielnaber.de)
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
   * USA
   */
  package org.languagetool.dev.diff;
  
  import org.jetbrains.annotations.Nullable;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  class DiffTools {
  
    private final static Pattern subIdPattern = Pattern.compile("\\[(\\d+)\\]");
  
    private DiffTools() {
    }
    
    static String getMasterId(String ruleId) {
      return ruleId.replaceFirst("\\[\\d+\\]", "").trim();
    }
  
    @Nullable
    static String getSubId(String ruleId) {
      Matcher matcher = subIdPattern.matcher(ruleId);
      if (matcher.find()) {
        return matcher.group(1);
      } else {
        return null;
      }
    }
  
  }
  