blocks|key|664499|text|my_string.replaceAll("\\p{C}",+"?");|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|664500|请参阅有关Unicode+regex的更多信息。java.util.regexPattern/String.replaceAll支持它们。|unstyled|offset|length|style|CODE|664501|entityMap|0|LINK|mutability|MUTABLE|url|http://www.regular-expressions.info/unicode.html^0|0|O|M|1B|H|5|D|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|T|8|@$G|U|H|V|I|J]|$G|W|H|X|I|J]]|9|@$G|Y|H|Z|1|10]]|A|$]]|$1|K|3|-4|5|F|7|11|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

<pre><code>my_string.replaceAll("\\p{C}", "?");
</code></pre>

See more about <a href="http://www.regular-expressions.info/unicode.html" rel="noreferrer">Unicode regex</a>. <code>java.util.regexPattern</code>/<code>String.replaceAll</code> supports them.

blocks|key|881627|text|我重新设计了电话号码%2B9+(987)+124124+Extract+digits+from+a+string+in+Java的代码|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|881628|+public+static+String+stripNonDigitsV2(+CharSequence+input+)+{
++++if+(input+==+null)
++++++++return+null;
++++if+(+input.length()+==+0+)
++++++++return+"";

++++char[]+result+=+new+char[input.length()];
++++int+cursor+=+0;
++++CharBuffer+buffer+=+CharBuffer.wrap(+input+);
++++int+i=0;
++++while+(+i<+buffer.length()++)+{+//buffer.hasRemaining()
++++++++char+chr+=+buffer.get(i);
++++++++if+(chr=='u'){
++++++++++++i=i%2B5;
++++++++++++chr=buffer.get(i);
++++++++}

++++++++if+(+chr+>+39+&&+chr+<+58+)
++++++++++++result[cursor%2B%2B]+=+chr;
++++++++i=i%2B1;
++++}

++++return+new+String(+result,+0,+cursor+);
}|code-block|syntax|javascript|881629|entityMap|0|LINK|mutability|MUTABLE|url|https://stackoverflow.com/questions/4030928/extract-digits-from-a-string-in-java^0|Q|10|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

I have redesigned the code for phone numbers +9 (987) 124124
<a href="https://stackoverflow.com/questions/4030928/extract-digits-from-a-string-in-java">Extract digits from a string in Java</a>

<pre><code> public static String stripNonDigitsV2( CharSequence input ) {
 if (input == null)
 return null;
 if ( input.length() == 0 )
 return "";

 char[] result = new char[input.length()];
 int cursor = 0;
 CharBuffer buffer = CharBuffer.wrap( input );
 int i=0;
 while ( i&lt; buffer.length() ) { //buffer.hasRemaining()
 char chr = buffer.get(i);
 if (chr=='u'){
 i=i+5;
 chr=buffer.get(i);
 }

 if ( chr &gt; 39 &amp;&amp; chr &lt; 58 )
 result[cursor++] = chr;
 i=i+1;
 }

 return new String( result, 0, cursor );
}
</code></pre>

blocks|key|881660|text|下面是你实现目标的方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|881661|public+static+String+removeNonAscii(String+str)
{
++++return+str.replaceAll("[%5E\\x00-\\x7F]",+"");
}

public+static+String+removeNonPrintable(String+str)+//+All+Control+Char
{
++++return+str.replaceAll("[\\p{C}]",+"");
}

public+static+String+removeSomeControlChar(String+str)+//+Some+Control+Char
{
++++return+str.replaceAll("[\\p{Cntrl}\\p{Cc}\\p{Cf}\\p{Co}\\p{Cn}]",+"");
}

public+static+String+removeFullControlChar(String+str)
{
++++return+removeNonPrintable(str).replaceAll("[\\r\\n\\t]",+"");
}+|code-block|syntax|javascript|881662|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

methods below for your goal
<pre><code>public static String removeNonAscii(String str)
{
 return str.replaceAll(&quot;[^\\x00-\\x7F]&quot;, &quot;&quot;);
}

public static String removeNonPrintable(String str) // All Control Char
{
 return str.replaceAll(&quot;[\\p{C}]&quot;, &quot;&quot;);
}

public static String removeSomeControlChar(String str) // Some Control Char
{
 return str.replaceAll(&quot;[\\p{Cntrl}\\p{Cc}\\p{Cf}\\p{Co}\\p{Cn}]&quot;, &quot;&quot;);
}

public static String removeFullControlChar(String str)
{
 return removeNonPrintable(str).replaceAll(&quot;[\\r\\n\\t]&quot;, &quot;&quot;);
} 
</code></pre>

blocks|key|881700|text|为此，我使用了这个简单的函数：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|881701|private+static+Pattern+pattern+=+Pattern.compile("[%5E+-~]");
private+static+String+cleanTheText(String+text)+{
++++Matcher+matcher+=+pattern.matcher(text);
++++if+(+matcher.find()+)+{
++++++++text+=+text.replace(matcher.group(0),+"");
++++}
++++return+text;
}|code-block|syntax|javascript|881702|希望这是有用的。|881703|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

I have used this simple function for this:

<pre><code>private static Pattern pattern = Pattern.compile("[^ -~]");
private static String cleanTheText(String text) {
 Matcher matcher = pattern.matcher(text);
 if ( matcher.find() ) {
 text = text.replace(matcher.group(0), "");
 }
 return text;
}
</code></pre>

Hope this is useful.

blocks|key|881742|text|我建议删除下面这样的不可打印字符，而不是替换它|type|unstyled|depth|inlineStyleRanges|entityRanges|data|881743|private+String+removeNonBMPCharacters(final+String+input)+{
++++StringBuilder+strBuilder+=+new+StringBuilder();
++++input.codePoints().forEach((i)+->+{
++++++++if+(Character.isSupplementaryCodePoint(i))+{
++++++++++++strBuilder.append("?");
++++++++}+else+{
++++++++++++strBuilder.append(Character.toChars(i));
++++++++}
++++});
++++return+strBuilder.toString();
}|code-block|syntax|javascript|881744|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

I propose it remove the non printable characters like below instead of replacing it 

<pre><code>private String removeNonBMPCharacters(final String input) {
 StringBuilder strBuilder = new StringBuilder();
 input.codePoints().forEach((i) -&gt; {
 if (Character.isSupplementaryCodePoint(i)) {
 strBuilder.append("?");
 } else {
 strBuilder.append(Character.toChars(i));
 }
 });
 return strBuilder.toString();
}
</code></pre>

blocks|key|664740|text|支持的多语言|type|unstyled|depth|inlineStyleRanges|entityRanges|data|664741|public+static+String+cleanUnprintableChars(String+text,+boolean+multilanguage)
{
++++String+regex+=+multilanguage+?+"[%5E\\x00-\\xFF]"+:+"[%5E\\x00-\\x7F]";
++++//+strips+off+all+non-ASCII+characters
++++text+=+text.replaceAll(regex,+"");

++++//+erases+all+the+ASCII+control+characters
++++text+=+text.replaceAll("[\\p{Cntrl}&&[%5E\r\n\t]]",+"");

++++//+removes+non-printable+characters+from+Unicode
++++text+=+text.replaceAll("\\p{C}",+"");

++++return+text.trim();
}|code-block|syntax|javascript|664742|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Supported multilanguage
<pre><code>public static String cleanUnprintableChars(String text, boolean multilanguage)
{
 String regex = multilanguage ? &quot;[^\\x00-\\xFF]&quot; : &quot;[^\\x00-\\x7F]&quot;;
 // strips off all non-ASCII characters
 text = text.replaceAll(regex, &quot;&quot;);

 // erases all the ASCII control characters
 text = text.replaceAll(&quot;[\\p{Cntrl}&amp;&amp;[^\r\n\t]]&quot;, &quot;&quot;);

 // removes non-printable characters from Unicode
 text = text.replaceAll(&quot;\\p{C}&quot;, &quot;&quot;);

 return text.trim();
}
</code></pre>

The following will replace ASCII control characters (shorthand for <code>[\x00-\x1F\x7F]</code>):

<pre><code>my_string.replaceAll("\\p{Cntrl}", "?");
</code></pre>

The following will replace all ASCII non-printable characters (shorthand for <code>[\p{Graph}\x20]</code>), including accented characters:

<pre><code>my_string.replaceAll("[^\\p{Print}]", "?");
</code></pre>

However, neither works for Unicode strings. Does anyone has a good way to remove non-printable characters from a unicode string?

How can I replace non-printable Unicode characters in Java?

以下字符将替换ASCII控制字符([\x00-\x1F\x7F]的简写)：my_string.replaceAll("\\p{Cntrl}", "?");以下代码将替换所有不可打印的ASCII码字符([\p{Graph}\x20]的简写)，包括重音字符：my_string.replaceAll("[^\\p{Print...

问如何在Java中替换不可打印的Unicode字符？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在Java中替换不可打印的Unicode字符？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问如何在Java中替换不可打印的Unicode字符？
EN