<blockquote>1. тест1; тест2; </blockquote>
<blockquote>2. тест1; тест2; </blockquote>
<blockquote>1) тест1; тест2; </blockquote>
<blockquote>2) тест1; тест2; </blockquote>
<blockquote>1. 1) тест1; тест2; </blockquote>
<blockquote>1) 1. тест1; тест2; </blockquote>
<blockquote>1. тест </blockquote>

String pattern = "(.*)<blockquote>1. ([\p{IsCyrillic}]*) </blockquote>(.*)";

String pattern = "(.*)<blockquote>[\d[\.\)]\s]+([[\p{IsCyrillic}][\d\;\s]+]+) </blockquote>(.*)";

String str = "<blockquote>1. тест </blockquote><blockquote>2. 1) ветка; метрика </blockquote>";

String p = "[(.*)<blockquote>[\d[\.\)]\s]+([[\p{IsCyrillic}][\d\;\s]+]+) </blockquote>(.*)]+";

String str = "<blockquote>1. тест </blockquote><blockquote>2. 1) ветка; метрика </blockquote>";

Pattern pattern1 = Pattern.compile("(тест)|(ветка;)|(метрика)");

Matcher matcher = pattern1.matcher(str);
while (matcher.find()) {
    System.out.print("Start index: " + matcher.start());
    System.out.print(" End index: " + matcher.end() + " ");
    System.out.println(matcher.group());
}

String pattern =
 "(.*)<blockquote>[\s\.\)\d]+([\p{IsCyrillic}\;\d\s]*)</blockquote>(.*)";

public static void main(String[] args){

    String[] testStrings = { "<blockquote>1. тест1; тест2; </blockquote>",
      "<blockquote>2. тест1; тест2; </blockquote>",
      "<blockquote>1) тест1; тест2; </blockquote>",
      "<blockquote>2) тест1; тест2; </blockquote>",
      "<blockquote>1. 1) тест1; тест2; </blockquote>",
      "<blockquote>1) 1. тест1; тест2; </blockquote>" };

    for (String testString : testStrings){

      String result = testString
        .replace("<blockquote>", "")
        .replace("</blockquote>", "")
        .replaceAll("\d\.|\d\)", "")
        .trim();

      System.out.println(result);
    }
  }