Escape special chars

import java.util.List;
import java.util.ArrayList;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
public class Escape {
  public static void main(String[] args) {
    String[] ss = {
      "テスト1{=test1-string1/.test2-string2/}-終わり"
      , "-{-{-}-}-"
      , "-{-}-}-"
      , "-{-{-}-"
      , "-}{-"
    };
    for (String s: ss) {
      process(s);
    }
  }

  private static void process(String src) {
    System.out.format("src    : %s\n", src);
    System.out.format("escape1: %s\n", escape1(src, '/', '-'));
    System.out.format("escape2: %s\n", escape2(src));
    System.out.println();
  }

  // http://stackoverflow.com/a/21791059
  private static List<Integer> stringToCodePoints(String in) {
    if( in == null)
      throw new NullPointerException("got null");
    List<Integer> out = new ArrayList<Integer>();
    final int length = in.length();
    for (int offset = 0; offset < length; ) {
      final int codepoint = in.codePointAt(offset);
      out.add(codepoint);
      offset += Character.charCount(codepoint);
    }
    return out;
  }

  private static String escape1(String src, char... cs) {
    char lbrace = '{';
    char rbrace = '}';
    StringBuilder sb = new StringBuilder();
    boolean in_brace = false;
    for (int c: stringToCodePoints(src)) {
      if (c == lbrace) {
        in_brace = true;
        sb.appendCodePoint(c);
        continue;
      }
      if (c == rbrace) {
        in_brace = false;
        sb.appendCodePoint(c);
        continue;
      }
      if (!in_brace) {
        sb.appendCodePoint(c);
        continue;
      }
      for (char e: cs) {
        if (c == e) {
          sb.appendCodePoint('\\');
          break;
        }
      }
      sb.appendCodePoint(c);
    }
    return sb.toString();
  }

  private static String escape2(String src) {
    Pattern balanced = Pattern.compile("(.*?\\{)(.*?\\})");
    Pattern special = Pattern.compile("[-/]");
    StringBuilder sb = new StringBuilder();
    int offset = 0;
    Matcher m = balanced.matcher(src);
    while (m.find()) {
      sb.append(m.group(1));
      sb.append(special.matcher(m.group(2)).replaceAll("\\\\$0"));
      offset = m.end();
    }
    sb.append(src.substring(offset));
    return sb.toString();
  }
}