Java String replace EOL with CRLF

//package com.demo2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String input = "demo2s.com\n\n\\r\rdemo2s.com";
        System.out.println(convertEOLToCRLF(input));
    }//from  ww w. j a  v a  2  s  . c  o m

    /** @deprecated Please inline this method. */
    public static String convertEOLToCRLF(String input) {
        return input.replaceAll("(\r\n|\r|\n)", "\r\n");
    }
}

//package com.demo2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String input = "demo2s.com\n\n\\r\rdemo2s.com";
        System.out.println(convertEOLToLF(input));
    }/*from  ww w  . j  a  v a2  s.c om*/

    /**
     * Converts any instances of "\r" or "\r\n" style EOLs into "\n" (Line Feed).
     */
    public static String convertEOLToLF(String input) {
        StringBuilder res = new StringBuilder(input.length());
        char[] s = input.toCharArray();
        int from = 0;
        final int end = s.length;
        for (int i = 0; i < end; i++) {
            if (s[i] == '\r') {
                res.append(s, from, i - from);
                res.append('\n');
                if (i + 1 < end && s[i + 1] == '\n') {
                    i++;
                }

                from = i + 1;
            }
        }

        if (from == 0) { // no \r!
            return input;
        }

        res.append(s, from, end - from);
        return res.toString();
    }

}