How to remove \u200B (Zero Length Whitespace Unicode Character) from String in Java?

Question

My application is using Spring Integration for email polling from Outlook mailbox.

As, it is receiving the String (email body)from an external system (Outlook), So I have no control over it.

For Example,

String emailBodyStr= "rejected by sundar14-\u200B.";

Now I am trying to remove the unicode character \u200B from this String.

What I tried already.

Try#1:

emailBodyStr = emailBodyStr.replaceAll("\u200B", "");

Try#2:

`emailBodyStr = emailBodyStr.replaceAll("\u200B", "").trim();`

Try#3 (using Apache Commons):

StringEscapeUtils.unescapeJava(emailBodyStr);

Try#4:

StringEscapeUtils.unescapeJava(emailBodyStr).trim();

Nothing worked till now.

When I tried to print this String using below code.

logger.info("Comment BEFORE:{}",emailBodyStr);
logger.info("Comment AFTER :{}",emailBodyStr);

In Eclipse console, it is NOT printing unicode char,

Comment BEFORE:rejected by sundar14-​.

But the same code prints the unicode char in Linux console as below.

Comment BEFORE:rejected by sundar14-\u200B.

I read some examples where str.replace() is recommended, but please note that examples uses javascript, PHP and not Java.

Answer 1

最后，我可以删除＆＃39; Zero Width Space＆＃39;使用＆＃39; Unicode Regex＆＃39;。

String plainEmailBody = new String();
plainEmailBody = emailBodyStr.replaceAll("[\\p{Cf}]", "");

参考以查找Unicode字符的类别。

1. 来自 Java 的字符类。
Java中的

Character类列出了所有这些unicode类别。



1. 网站： http://www.fileformat.info/



1. 网站 http://www.regular-expressions.info/ =＆gt; Unicode正则表达式



注1：当我从 Outlook电子邮件正文收到此字符串时，无我的问题中列出的方法正在运行。

  

我的应用程序正在从外部系统接收字符串   （ Outlook ），所以我无法控制它。

注2：此SO answer帮助我了解 Unicode正则表达式。