String replace function not working in android

Question

I used the following code to replace occurrence of '\' but its not working.

msg="\uD83D\uDE0A";
msg=msg.replace("\\", "|");

I spent a lot of time in Google. But didn't find any solution.

Also tried

msg="\uD83D\uDE0A";
msg=msg.replace("\", "|");

`msg="\uD83D\uDE0A";` doesn't actually contain any backslashes. The `\u####` gets compiled into a [unicode character](http://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#unicode) — khelwood, Jun 08 '15 at 10:28
ya its a unicode of a laughing smiley. But is there any options to do as mentioned in the question? — Jarish Jose, Jun 08 '15 at 10:29
What are you trying to do actually -- replace the smileys with a pipe character, or something else? — Mick Mnemonic, Jun 08 '15 at 10:33
@MickMnemonic i want to send the unicode of smiley to my web url, but when it reaches there it missing the \. Thats why am trying to change it with |. — Jarish Jose, Jun 08 '15 at 10:37
if you can't control the input you have to get back original string before replace .http://stackoverflow.com/questions/13700333/convert-escaped-unicode-character-back-to-actual-character — Madhawa Priyashantha, Jun 08 '15 at 10:37
@FastSnail pls check the above comment. Hope you will understand my problem. — Jarish Jose, Jun 08 '15 at 10:48
@JarishJose i'm not families about web url .can't you send msg directly ? — Madhawa Priyashantha, Jun 08 '15 at 10:55
Try this: http://stackoverflow.com/questions/6198986/how-can-i-replace-non-printable-unicode-characters-in-java — V_J, Jun 09 '15 at 13:56

score 4 · Answer 1 · answered Jun 08 '15 at 10:28

4

The msg string defined must also use an escape character like this:

msg="\\uD83D\\uDE0A";
msg=msg.replace("\\", "|");

That code will work and it will result in: |uD83D|uDE0A

answered Jun 08 '15 at 10:28

reidzeibel

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i cant controll the input. – Jarish Jose Jun 08 '15 at 10:31
1

what if we want to do with same input mentioned in question ? – Muhammad Suleman Jun 08 '15 at 10:33
1

@JarishJose plz read http://stackoverflow.com/questions/13700333/convert-escaped-unicode-character-back-to-actual-character – Madhawa Priyashantha Jun 08 '15 at 10:35

score 0 · Answer 2 · answered Jun 08 '15 at 10:36

If you want to show the unicode integer value of a unicode character, you can do something like this:

String.format("\\u%04X", ch);

(or use "|" instead of "\\" if you prefer).

You could go through each character in the string and convert it to a literal string like "|u####" if that is what you want.

score 0 · Answer 3 · edited May 23 '17 at 10:26

From what I understand, you want to get the unicode representation of a string. For that you can use the answer from here.

private static String escapeNonAscii(String str) {

  StringBuilder retStr = new StringBuilder();
  for(int i=0; i<str.length(); i++) {
    int cp = Character.codePointAt(str, i);
    int charCount = Character.charCount(cp);
    if (charCount > 1) {
      i += charCount - 1; // 2.
      if (i >= str.length()) {
        throw new IllegalArgumentException("truncated unexpectedly");
      }
    }

    if (cp < 128) {
      retStr.appendCodePoint(cp);
    } else {
      retStr.append(String.format("\\u%x", cp));
    }
  }
  return retStr.toString();
}

This will give you the unicode value as a String which you can then replace as you like.

String replace function not working in android

3 Answers3