how to remove unicode spaces from String returned by reader.readLine()

Question

I when i use reader.readLine(), the string length is always 80 chars and after the main string unicode spaces are padded up. Is there a way to remove those unwanted characters. (java.io.RandomAccessFile reader) String.trim is not working on this

The question is a bit too narrow. For example, I searched stackoverflow for "[java] internationalization trim" and "[java] unicode trim" and did *not* find this question. You really want a trim() function that is I18N/Unicode aware; if the question was phrased that way, more people would be able to find the answer below. — djb, Oct 09 '15 at 13:49

score 7 · Answer 1 · answered Jul 15 '13 at 11:09

7

You can use StringUtils.strip from Commons Lang. It is Unicode-aware.

answered Jul 15 '13 at 11:09

Thilo

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well it uses Character.isWhitespace which doesn't work well. It should use newer Character.isSpaceChar to be fully unicode-aware – Michal Bernhard Aug 12 '16 at 11:12

AllTooSir · Answer 2 · 2013-07-15T11:22:24.623

3

You can write a custom method in Java to remove the Unicode space characters , using Character.isWhitespace(char) and Character.isSpaceChar(char) methods, for your specific purpose.

The Spring framework has a StringUtils class with a trimWhitespace(String) method which appears to be based on Character.isWhitespace(char) from the source code here.

edited Jul 15 '13 at 11:22

answered Jul 15 '13 at 11:10

AllTooSir

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score 0 · Answer 3 · answered Aug 12 '16 at 12:01

0

use Google Guava

CharMatcher.WHITESPACE.trimFrom(source);

or try this https://gist.github.com/michalbcz/4861a2b8ed73bb73764e909b87664cb2

answered Aug 12 '16 at 12:01

Michal Bernhard

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score 0 · Answer 4 · answered Apr 26 '19 at 09:41

If you do not want a big libs. Just use:

str.replaceAll("^[\\s\\p{Z}]+|[\\s\\p{Z}]+$", "");

Testing

    public static String trim(String str) {
        return str.replaceAll("^[\\s\\p{Z}]+|[\\s\\p{Z}]+$", "");
    }

    public static void main(String[] args) {
        System.out.println(trim("\t tes ting \u00a0").length());
        System.out.println(trim("\t testing \u00a0").length());
        System.out.println(trim("tes ting \u00a0").length());
        System.out.println(trim("\t tes ting").length());
    }

score -2 · Answer 5 · edited May 23 '17 at 12:16

-2

would have been faster to just search stackoverflow for this question becoz there are multiple questions on that topic there. well, try this:

st.replaceAll("\\s","")

check this one here: link

edited May 23 '17 at 12:16

Community

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answered Jul 15 '13 at 11:09

bofredo

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That removes ALL space, though, not just the padding. – Thilo Jul 15 '13 at 11:10

how to remove unicode spaces from String returned by reader.readLine()

5 Answers5