如何替换字符串的某些字符

Question

• I have a string @B1AdGODG7:Devrath%Dev\¶
• I want to replace \¶ with ¶

I tried with

String comments="@B1AdGODG7:Devrath%Dev\u00B6";
comments=comments.replaceAll("\u00B6","¶");

• Output : @B1AdGODG7:Devrath%Dev\¶

• Required Output : @B1AdGODG7:Devrath%Dev¶

---

• ReplaceAll is not working
• How to make the required output

Snapshot:

Answer 1

\¶ is a single character, with the Unicode code point of 0xB6; writing \¶ is literally the same as writing ¶.

So, you need to escape the backslash: \\\\ . Furthermore, backslashes are special in regular expressions, which replaceAll uses, so you need to escape it again -- and that escape needs to be escaped: replaceAll("\\\\\\\¶", "¶") .

You could also use Pattern.quote for that second level of escaping (the one for the regex): replaceAll(Pattern.quote("\\\¶"), "¶") .

Answer 2

I get below example from http://techidiocy.com/replace-unicode-characters-from-java-string/ . I think it is work for u

public static StringBuffer removeUTFCharacters(String data){
Pattern p = Pattern.compile("\\\\u(\\p{XDigit}{4})");
Matcher m = p.matcher(data);
StringBuffer buf = new StringBuffer(data.length());
while (m.find()) {
String ch = String.valueOf((char) Integer.parseInt(m.group(1), 16));
m.appendReplacement(buf, Matcher.quoteReplacement(ch));
}
m.appendTail(buf);
return buf;
}

Answer 3

I use StringEscapeUtils provided by apache.

You can use it by adding following dependency:

implementation 'org.apache.commons:commons-text:1.4'

Code Sample:

String comments="@B1AdGODG7:Devrath%Dev\u00B6";
Log.d("output", StringEscapeUtils.unescapeJava(comments));

Output:

D/output: @B1AdGODG7:Devrath%Dev¶

This is the most reliable solution i have come across for this problem and have been using it for a while.