blocks|key|1093479|text|基于Emoji完整列表，v11.0，您需要删除1644个不同的Unicode代码点。例如，✅作为U%2B2705在此列表中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1093480|拥有完整的表情列表，您需要使用码点过滤掉它们。迭代单个char或byte不能工作，因为单个代码点可以跨越多个字节。因为Java使用UTF-16表情符号，所以通常需要两个char。|1093481|String+input+=+"ab✅cd";
for+(int+i+=+0;+i+<+input.length();)+{
++int+cp+=+input.codePointAt(i);
++//+filter+out+if+matches
++i+%2B=+Character.charCount(cp);+
}|code-block|syntax|javascript|1093482|从Unicode代码点U%2B2705到Java+int的映射非常简单：|1093483|int+viSign+=+0x2705;|1093484|或者因为Java支持Unicode字符串：|1093485|int+viSign+=+"✅".codePointAt(0);|1093486|entityMap|0|LINK|mutability|MUTABLE|url|https://unicode.org/emoji/charts/full-emoji-list.html|1|https://unicode.org/emoji/charts/full-emoji-list.html#2705|2|https://docs.oracle.com/javase/tutorial/i18n/text/characterClass.html^0|19|1|1C|6|2|F|0|1C|6|1|0|R|4|W|4|2C|4|F|2|2|0|0|B|6|N|3|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@$9|1B|A|1C|1|1D]|$9|1E|A|1F|1|1G]]|E|$]]|$1|F|3|G|5|6|7|1H|8|@$9|1I|A|1J|B|C]|$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]]|D|@$9|1O|A|1P|1|1Q]]|E|$]]|$1|H|3|I|5|J|7|1R|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|1S|8|@$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|1X|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|1Y|8|@]|D|@]|E|$]]|$1|S|3|T|5|J|7|1Z|8|@]|D|@]|E|$K|L]]|$1|U|3|-4|5|6|7|20|8|@]|D|@]|E|$]]]|V|$W|$5|X|Y|Z|E|$10|11]]|12|$5|X|Y|Z|E|$10|13]]|14|$5|X|Y|Z|E|$10|15]]]]

Based on <a href="https://unicode.org/emoji/charts/full-emoji-list.html" rel="noreferrer">Full Emoji List, v11.0</a> you have 1644 different Unicode code points to remove. For example <code>✅</code> is on this list as <a href="https://unicode.org/emoji/charts/full-emoji-list.html#2705" rel="noreferrer"><code>U+2705</code></a>. 

Having the full list of emojis you need to filter them out using <a href="https://docs.oracle.com/javase/tutorial/i18n/text/characterClass.html" rel="noreferrer">code points</a>. Iterating over single <code>char</code> or <code>byte</code> won't work as single code point can span multiple bytes. Because Java uses UTF-16 emojis will usually take two <code>char</code>s.

<pre><code>String input = "ab✅cd";
for (int i = 0; i &lt; input.length();) {
 int cp = input.codePointAt(i);
 // filter out if matches
 i += Character.charCount(cp); 
}
</code></pre>

Mapping from Unicode code point <code>U+2705</code> to Java <code>int</code> is straightforward:

<pre><code>int viSign = 0x2705;
</code></pre>

or since Java supports Unicode Strings:

<pre><code>int viSign = "✅".codePointAt(0);
</code></pre>

blocks|key|1093488|text|与其将某些元素列入黑名单，不如创建一个您希望保留的字符的白名单如何？这样你就不用担心每一个新的表情符号都被添加了。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1093489|String+characterFilter+=+"[%5E\\p{L}\\p{M}\\p{N}\\p{P}\\p{Z}\\p{Cf}\\p{Cs}\\s]";
String+emotionless+=+aString.replaceAll(characterFilter,"");|code-block|syntax|javascript|1093490|所以：|1093491|[\\p{L}\\p{M}\\p{N}\\p{P}\\p{Z}\\p{Cf}\\p{Cs}\\s]是一个范围，表示所有数字(\\p{N})、字母(\\p{L})、标记(\\p{M})、标点符号(\\p{P})、空格/分隔符(\\p{Z})、其他格式(\\p{Cf})以及在U%2BFFFF上的Unicode+(\\p{Cs})和换行符(\\s)中的其他字符。\\p{L}+specifically包括其他字母中的字符，如西里尔字母、拉丁字母、汉字等。|unordered-list-item|offset|length|style|CODE|BOLD|1093492|regex字符集中的%5E否定匹配。|1093493|示例：|1093494|String+str+=+"hello+world+_#+皆さん、こんにちは！　私はジョンと申します。";
System.out.print(str.replaceAll("[%5E\\p{L}\\p{M}\\p{N}\\p{P}\\p{Z}\\p{Cf}\\p{Cs}\\s]",""));
//+Output:
//+++"hello+world+_#+皆さん、こんにちは！　私はジョンと申します。"|1093495|如果您需要更多信息，请查看文档中的regexes。|1093496|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#unicode^0|0|0|0|0|1D|1Q|6|21|6|2C|6|2P|6|34|6|3H|7|3S|6|49|7|4M|3|4X|6|4X|6|54|C|0|A|1|0|0|0|D|2|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|18|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|19|8|@$L|1A|M|1B|N|O]|$L|1C|M|1D|N|O]|$L|1E|M|1F|N|O]|$L|1G|M|1H|N|O]|$L|1I|M|1J|N|O]|$L|1K|M|1L|N|O]|$L|1M|M|1N|N|O]|$L|1O|M|1P|N|O]|$L|1Q|M|1R|N|O]|$L|1S|M|1T|N|O]|$L|1U|M|1V|N|O]|$L|1W|M|1X|N|P]|$L|1Y|M|1Z|N|P]]|9|@]|A|$]]|$1|Q|3|R|5|K|7|20|8|@$L|21|M|22|N|O]]|9|@]|A|$]]|$1|S|3|T|5|6|7|23|8|@]|9|@]|A|$]]|$1|U|3|V|5|D|7|24|8|@]|9|@]|A|$E|F]]|$1|W|3|X|5|6|7|25|8|@]|9|@$L|26|M|27|1|28]]|A|$]]|$1|Y|3|-4|5|6|7|29|8|@]|9|@]|A|$]]]|Z|$10|$5|11|12|13|A|$14|15]]]]

Instead of blacklisting some elements, how about creating a whitelist of the characters you do wish to keep? This way you don't need to worry about every new emoji being added.

<pre><code>String characterFilter = "[^\\p{L}\\p{M}\\p{N}\\p{P}\\p{Z}\\p{Cf}\\p{Cs}\\s]";
String emotionless = aString.replaceAll(characterFilter,"");
</code></pre>

So:

<ul>
<li><code>[\\p{L}\\p{M}\\p{N}\\p{P}\\p{Z}\\p{Cf}\\p{Cs}\\s]</code> is a range representing all numeric (<code>\\p{N}</code>), letter (<code>\\p{L}</code>), mark (<code>\\p{M}</code>), punctuation (<code>\\p{P}</code>), whitespace/separator (<code>\\p{Z}</code>), other formatting (<code>\\p{Cf}</code>) and other characters above <code>U+FFFF</code> in Unicode (<code>\\p{Cs}</code>), and newline (<code>\\s</code>) characters. <code>\\p{L}</code> specifically includes the characters from other alphabets such as Cyrillic, Latin, Kanji, etc. </li>
<li>The <code>^</code> in the regex character set negates the match.</li>
</ul>

Example:

<pre><code>String str = "hello world _# 皆さん、こんにちは！　私はジョンと申します。";
System.out.print(str.replaceAll("[^\\p{L}\\p{M}\\p{N}\\p{P}\\p{Z}\\p{Cf}\\p{Cs}\\s]",""));
// Output:
// "hello world _# 皆さん、こんにちは！　私はジョンと申します。"
</code></pre>

If you need more information, check out the Java <a href="https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html#unicode" rel="noreferrer">documentation</a> for regexes.

blocks|key|914911|text|我不是很喜欢Java，所以我不会尝试内联地编写示例代码，但是我这样做的方法是检查Unicode所称的每个字符的“一般类别”。有几个字母和标点符号类别。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|914912|您可以使用Character.getType查找给定字符的一般类别。您可能应该保留属于以下一般类别的字符：|offset|length|914913|COMBINING_SPACING_MARK
CONNECTOR_PUNCTUATION
CURRENCY_SYMBOL
DASH_PUNCTUATION
DECIMAL_DIGIT_NUMBER
ENCLOSING_MARK
END_PUNCTUATION
FINAL_QUOTE_PUNCTUATION
FORMAT
INITIAL_QUOTE_PUNCTUATION
LETTER_NUMBER
LINE_SEPARATOR
LOWERCASE_LETTER
MATH_SYMBOL
MODIFIER_LETTER
MODIFIER_SYMBOL
NON_SPACING_MARK
OTHER_LETTER
OTHER_NUMBER
OTHER_PUNCTUATION
PARAGRAPH_SEPARATOR
SPACE_SEPARATOR
START_PUNCTUATION
TITLECASE_LETTER
UPPERCASE_LETTER|code-block|syntax|javascript|914914|(您列出的所有要删除的字符都有通用类别OTHER_SYMBOL，我在上面的类别白名单中没有包括这个类别。)|style|CODE|914915|entityMap|0|LINK|mutability|MUTABLE|url|https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#getType(char)^0|0|5|H|0|0|0|J|C|0^^$0|@$1|2|3|4|5|6|7|W|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|F|3|G|5|H|7|11|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|12|8|@$D|13|E|14|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|P|$Q|$5|R|S|T|A|$U|V]]]]

I'm not super into Java, so I won't try to write example code inline, but the way I would do this is to check what Unicode calls "the general category" of each character. There are a couple letter and punctuation categories.

You can use <a href="https://docs.oracle.com/javase/7/docs/api/java/lang/Character.html#getType(char)" rel="noreferrer">Character.getType</a> to find the general category of a given character. You should probably retain those characters that fall in these general categories:

<pre><code>COMBINING_SPACING_MARK
CONNECTOR_PUNCTUATION
CURRENCY_SYMBOL
DASH_PUNCTUATION
DECIMAL_DIGIT_NUMBER
ENCLOSING_MARK
END_PUNCTUATION
FINAL_QUOTE_PUNCTUATION
FORMAT
INITIAL_QUOTE_PUNCTUATION
LETTER_NUMBER
LINE_SEPARATOR
LOWERCASE_LETTER
MATH_SYMBOL
MODIFIER_LETTER
MODIFIER_SYMBOL
NON_SPACING_MARK
OTHER_LETTER
OTHER_NUMBER
OTHER_PUNCTUATION
PARAGRAPH_SEPARATOR
SPACE_SEPARATOR
START_PUNCTUATION
TITLECASE_LETTER
UPPERCASE_LETTER
</code></pre>

(All of the characters you listed as specifically wanting to remove have general category <code>OTHER_SYMBOL</code>, which I did not include in the above category whitelist.)

blocks|key|2181101|text|我举了几个例子，认为拉丁语已经足够了，但是.|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2181102|有没有办法从输入字符串中删除所有这些符号，并且只保留不同语言中的字母&标点符号？|blockquote|2181103|编辑之后，使用Character.getType方法开发了一个新的解决方案，这似乎是最好的解决方案。|offset|length|style|CODE|2181104|package+zmarcos.emoji;

import+java.util.Arrays;
import+java.util.HashSet;
import+java.util.Set;

public+class+TestEmoji+{

++++public+static+void+main(String[]+args)+{
++++++++String[]+arr+=+{"Remove+✅,+,+✈+,+♛+and+other+such+signs+from+Java+string",
++++++++++++"→+Cats+and+dogs",
++++++++++++"I'm+on+",
++++++++++++"Apples+⚛+",
++++++++++++"✅+Vi+sign",
++++++++++++"♛+I'm+the+king+♛+",
++++++++++++"Star+me+★",
++++++++++++"Star+⭐+once+more",
++++++++++++"早上好+♛",
++++++++++++"Καλημέρα+✂"};
++++++++System.out.println("---only+letters+and+spaces+alike---\n");
++++++++for+(String+input+:+arr)+{
++++++++++++int[]+filtered+=+input.codePoints().filter((cp)+->+Character.isLetter(cp)+%7C%7C+Character.isWhitespace(cp)).toArray();
++++++++++++String+result+=+new+String(filtered,+0,+filtered.length);
++++++++++++System.out.println(input);
++++++++++++System.out.println(result);
++++++++}

++++++++System.out.println("\n---unicode+blocks+white---\n");
++++++++Set<Character.UnicodeBlock>+whiteList+=+new+HashSet<>();
++++++++whiteList.add(Character.UnicodeBlock.BASIC_LATIN);
++++++++for+(String+input+:+arr)+{
++++++++++++int[]+filtered+=+input.codePoints().filter((cp)+->+whiteList.contains(Character.UnicodeBlock.of(cp))).toArray();
++++++++++++String+result+=+new+String(filtered,+0,+filtered.length);
++++++++++++System.out.println(input);
++++++++++++System.out.println(result);
++++++++}

++++++++System.out.println("\n---unicode+blocks+black---\n");
++++++++Set<Character.UnicodeBlock>+blackList+=+new+HashSet<>();++++++++
++++++++blackList.add(Character.UnicodeBlock.EMOTICONS);
++++++++blackList.add(Character.UnicodeBlock.MISCELLANEOUS_TECHNICAL);
++++++++blackList.add(Character.UnicodeBlock.MISCELLANEOUS_SYMBOLS);
++++++++blackList.add(Character.UnicodeBlock.MISCELLANEOUS_SYMBOLS_AND_ARROWS);
++++++++blackList.add(Character.UnicodeBlock.MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS);
++++++++blackList.add(Character.UnicodeBlock.ALCHEMICAL_SYMBOLS);
++++++++blackList.add(Character.UnicodeBlock.TRANSPORT_AND_MAP_SYMBOLS);
++++++++blackList.add(Character.UnicodeBlock.GEOMETRIC_SHAPES);
++++++++blackList.add(Character.UnicodeBlock.DINGBATS);
++++++++for+(String+input+:+arr)+{
++++++++++++int[]+filtered+=+input.codePoints().filter((cp)+->+!blackList.contains(Character.UnicodeBlock.of(cp))).toArray();
++++++++++++String+result+=+new+String(filtered,+0,+filtered.length);
++++++++++++System.out.println(input);
++++++++++++System.out.println(result);
++++++++}
++++++++System.out.println("\n---category---\n");
++++++++int[]+category+=+{Character.COMBINING_SPACING_MARK,+Character.COMBINING_SPACING_MARK,+Character.CONNECTOR_PUNCTUATION,+/*Character.CONTROL,*/+Character.CURRENCY_SYMBOL,
++++++++++++Character.DASH_PUNCTUATION,+Character.DECIMAL_DIGIT_NUMBER,+Character.ENCLOSING_MARK,+Character.END_PUNCTUATION,+Character.FINAL_QUOTE_PUNCTUATION,
++++++++++++/*Character.FORMAT,*/+Character.INITIAL_QUOTE_PUNCTUATION,+Character.LETTER_NUMBER,+Character.LINE_SEPARATOR,+Character.LOWERCASE_LETTER,
++++++++++++/*Character.MATH_SYMBOL,*/+Character.MODIFIER_LETTER,+/*Character.MODIFIER_SYMBOL,*/+Character.NON_SPACING_MARK,+Character.OTHER_LETTER,+Character.OTHER_NUMBER,
++++++++++++Character.OTHER_PUNCTUATION,+/*Character.OTHER_SYMBOL,*/+Character.PARAGRAPH_SEPARATOR,+/*Character.PRIVATE_USE,*/
++++++++++++Character.SPACE_SEPARATOR,+Character.START_PUNCTUATION,+/*Character.SURROGATE,*/+Character.TITLECASE_LETTER,+/*Character.UNASSIGNED,*/+Character.UPPERCASE_LETTER};
++++++++Arrays.sort(category);
++++++++for+(String+input+:+arr)+{
++++++++++++int[]+filtered+=+input.codePoints().filter((cp)+->+Arrays.binarySearch(category,+Character.getType(cp))+>=+0).toArray();
++++++++++++String+result+=+new+String(filtered,+0,+filtered.length);
++++++++++++System.out.println(input);
++++++++++++System.out.println(result);
++++++++}
++++}

}|code-block|syntax|javascript|2181105|输出：|2181106|---only+letters+and+spaces+alike---

Remove+✅,+,+✈+,+♛+and+other+such+signs+from+Java+string
Remove++++++and+other+such+signs+from+Java+string
→+Cats+and+dogs
+Cats+and+dogs
I'm+on+
Im+on+
Apples+⚛+
Apples++
✅+Vi+sign
+Vi+sign
♛+I'm+the+king+♛+
+Im+the+king++
Star+me+★
Star+me+
Star+⭐+once+more
Star++once+more
早上好+♛
早上好+
Καλημέρα+✂
Καλημέρα+

---unicode+blocks+white---

Remove+✅,+,+✈+,+♛+and+other+such+signs+from+Java+string
Remove+,+,++,++and+other+such+signs+from+Java+string
→+Cats+and+dogs
+Cats+and+dogs
I'm+on+
I'm+on+
Apples+⚛+
Apples++
✅+Vi+sign
+Vi+sign
♛+I'm+the+king+♛+
+I'm+the+king++
Star+me+★
Star+me+
Star+⭐+once+more
Star++once+more
早上好+♛

Καλημέρα+✂


---unicode+blocks+black---

Remove+✅,+,+✈+,+♛+and+other+such+signs+from+Java+string
Remove+,+,++,++and+other+such+signs+from+Java+string
→+Cats+and+dogs
→+Cats+and+dogs
I'm+on+
I'm+on+
Apples+⚛+
Apples++
✅+Vi+sign
+Vi+sign
♛+I'm+the+king+♛+
+I'm+the+king++
Star+me+★
Star+me+
Star+⭐+once+more
Star++once+more
早上好+♛
早上好+
Καλημέρα+✂
Καλημέρα+

---category---

Remove+✅,+,+✈+,+♛+and+other+such+signs+from+Java+string
Remove+,+,++,++and+other+such+signs+from+Java+string
→+Cats+and+dogs
+Cats+and+dogs
I'm+on+
I'm+on+
Apples+⚛+
Apples++
✅+Vi+sign
+Vi+sign
♛+I'm+the+king+♛+
+I'm+the+king++
Star+me+★
Star+me+
Star+⭐+once+more
Star++once+more
早上好+♛
早上好+
Καλημέρα+✂
Καλημέρα+|2181107|代码通过将字符串流到代码点来工作。然后使用lambda将字符过滤为int数组，然后将数组转换为String。|2181108|字母和空格正在使用字符方法来过滤，不擅长标点符号。失败了，。|BOLD|2181109|unicode使用程序员指定为允许的unicode块阻止白色过滤器。失败了，。|2181110|unicode使用程序员指定为不允许的unicode块阻止黑色过滤器。失败了，。|2181111|使用静态方法筛选器Character.getType。程序员可以在category数组中定义允许的类型。工作。|2181112|entityMap^0|0|0|7|H|0|0|0|0|X|3|0|0|5|P|4|0|0|U|Y|4|0|0|V|Z|4|0|9|H|X|8|1G|2|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|17|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|18|8|@$G|19|H|1A|I|J]]|9|@]|A|$]]|$1|K|3|L|5|M|7|1B|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|1C|8|@]|9|@]|A|$]]|$1|R|3|S|5|M|7|1D|8|@]|9|@]|A|$N|O]]|$1|T|3|U|5|6|7|1E|8|@$G|1F|H|1G|I|J]]|9|@]|A|$]]|$1|V|3|W|5|6|7|1H|8|@$G|1I|H|1J|I|X]|$G|1K|H|1L|I|X]]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1M|8|@$G|1N|H|1O|I|X]|$G|1P|H|1Q|I|X]]|9|@]|A|$]]|$1|10|3|11|5|6|7|1R|8|@$G|1S|H|1T|I|X]|$G|1U|H|1V|I|X]]|9|@]|A|$]]|$1|12|3|13|5|6|7|1W|8|@$G|1X|H|1Y|I|J]|$G|1Z|H|20|I|J]|$G|21|H|22|I|X]]|9|@]|A|$]]|$1|14|3|-4|5|6|7|23|8|@]|9|@]|A|$]]]|15|$]]

I gave some examples below, and thought that Latin is enough, but...

<blockquote>
 Is there a way to remove all these signs from the input string and
 keeping only the letters &amp; punctuation in the different languages?
</blockquote>

After editing, developed a new solution, using the <code>Character.getType</code> method, and that appears to be the best shot at this.

<pre><code>package zmarcos.emoji;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

public class TestEmoji {

 public static void main(String[] args) {
 String[] arr = {"Remove ✅, , ✈ , ♛ and other such signs from Java string",
 "→ Cats and dogs",
 "I'm on ",
 "Apples ⚛ ",
 "✅ Vi sign",
 "♛ I'm the king ♛ ",
 "Star me ★",
 "Star ⭐ once more",
 "早上好 ♛",
 "Καλημέρα ✂"};
 System.out.println("---only letters and spaces alike---\n");
 for (String input : arr) {
 int[] filtered = input.codePoints().filter((cp) -&gt; Character.isLetter(cp) || Character.isWhitespace(cp)).toArray();
 String result = new String(filtered, 0, filtered.length);
 System.out.println(input);
 System.out.println(result);
 }

 System.out.println("\n---unicode blocks white---\n");
 Set&lt;Character.UnicodeBlock&gt; whiteList = new HashSet&lt;&gt;();
 whiteList.add(Character.UnicodeBlock.BASIC_LATIN);
 for (String input : arr) {
 int[] filtered = input.codePoints().filter((cp) -&gt; whiteList.contains(Character.UnicodeBlock.of(cp))).toArray();
 String result = new String(filtered, 0, filtered.length);
 System.out.println(input);
 System.out.println(result);
 }

 System.out.println("\n---unicode blocks black---\n");
 Set&lt;Character.UnicodeBlock&gt; blackList = new HashSet&lt;&gt;(); 
 blackList.add(Character.UnicodeBlock.EMOTICONS);
 blackList.add(Character.UnicodeBlock.MISCELLANEOUS_TECHNICAL);
 blackList.add(Character.UnicodeBlock.MISCELLANEOUS_SYMBOLS);
 blackList.add(Character.UnicodeBlock.MISCELLANEOUS_SYMBOLS_AND_ARROWS);
 blackList.add(Character.UnicodeBlock.MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS);
 blackList.add(Character.UnicodeBlock.ALCHEMICAL_SYMBOLS);
 blackList.add(Character.UnicodeBlock.TRANSPORT_AND_MAP_SYMBOLS);
 blackList.add(Character.UnicodeBlock.GEOMETRIC_SHAPES);
 blackList.add(Character.UnicodeBlock.DINGBATS);
 for (String input : arr) {
 int[] filtered = input.codePoints().filter((cp) -&gt; !blackList.contains(Character.UnicodeBlock.of(cp))).toArray();
 String result = new String(filtered, 0, filtered.length);
 System.out.println(input);
 System.out.println(result);
 }
 System.out.println("\n---category---\n");
 int[] category = {Character.COMBINING_SPACING_MARK, Character.COMBINING_SPACING_MARK, Character.CONNECTOR_PUNCTUATION, /*Character.CONTROL,*/ Character.CURRENCY_SYMBOL,
 Character.DASH_PUNCTUATION, Character.DECIMAL_DIGIT_NUMBER, Character.ENCLOSING_MARK, Character.END_PUNCTUATION, Character.FINAL_QUOTE_PUNCTUATION,
 /*Character.FORMAT,*/ Character.INITIAL_QUOTE_PUNCTUATION, Character.LETTER_NUMBER, Character.LINE_SEPARATOR, Character.LOWERCASE_LETTER,
 /*Character.MATH_SYMBOL,*/ Character.MODIFIER_LETTER, /*Character.MODIFIER_SYMBOL,*/ Character.NON_SPACING_MARK, Character.OTHER_LETTER, Character.OTHER_NUMBER,
 Character.OTHER_PUNCTUATION, /*Character.OTHER_SYMBOL,*/ Character.PARAGRAPH_SEPARATOR, /*Character.PRIVATE_USE,*/
 Character.SPACE_SEPARATOR, Character.START_PUNCTUATION, /*Character.SURROGATE,*/ Character.TITLECASE_LETTER, /*Character.UNASSIGNED,*/ Character.UPPERCASE_LETTER};
 Arrays.sort(category);
 for (String input : arr) {
 int[] filtered = input.codePoints().filter((cp) -&gt; Arrays.binarySearch(category, Character.getType(cp)) &gt;= 0).toArray();
 String result = new String(filtered, 0, filtered.length);
 System.out.println(input);
 System.out.println(result);
 }
 }

}
</code></pre>

Output:

<pre><code>---only letters and spaces alike---

Remove ✅, , ✈ , ♛ and other such signs from Java string
Remove and other such signs from Java string
→ Cats and dogs
 Cats and dogs
I'm on 
Im on 
Apples ⚛ 
Apples 
✅ Vi sign
 Vi sign
♛ I'm the king ♛ 
 Im the king 
Star me ★
Star me 
Star ⭐ once more
Star once more
早上好 ♛
早上好 
Καλημέρα ✂
Καλημέρα 

---unicode blocks white---

Remove ✅, , ✈ , ♛ and other such signs from Java string
Remove , , , and other such signs from Java string
→ Cats and dogs
 Cats and dogs
I'm on 
I'm on 
Apples ⚛ 
Apples 
✅ Vi sign
 Vi sign
♛ I'm the king ♛ 
 I'm the king 
Star me ★
Star me 
Star ⭐ once more
Star once more
早上好 ♛

Καλημέρα ✂


---unicode blocks black---

Remove ✅, , ✈ , ♛ and other such signs from Java string
Remove , , , and other such signs from Java string
→ Cats and dogs
→ Cats and dogs
I'm on 
I'm on 
Apples ⚛ 
Apples 
✅ Vi sign
 Vi sign
♛ I'm the king ♛ 
 I'm the king 
Star me ★
Star me 
Star ⭐ once more
Star once more
早上好 ♛
早上好 
Καλημέρα ✂
Καλημέρα 

---category---

Remove ✅, , ✈ , ♛ and other such signs from Java string
Remove , , , and other such signs from Java string
→ Cats and dogs
 Cats and dogs
I'm on 
I'm on 
Apples ⚛ 
Apples 
✅ Vi sign
 Vi sign
♛ I'm the king ♛ 
 I'm the king 
Star me ★
Star me 
Star ⭐ once more
Star once more
早上好 ♛
早上好 
Καλημέρα ✂
Καλημέρα 
</code></pre>

The code works by streaming the String to code-points. Then using lambdas to filter characters into a <code>int</code> array, then we convert the array to String.

The letters and spaces are using using the Character methods to filter, not good with punctuation. Failed attempt.

The unicode blocks white filter using the unicode blocks the programmer specifies as allowed. Failed attempt. 

The unicode blocks black filter using the unicode blocks the programmer specifies as not allowed. Failed attempt.

The category filter using the static method <code>Character.getType</code>. The programmer can define in the <code>category</code> array what types are allowed. WORKS.

blocks|key|1093571|text|ICU4J是你的朋友。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1093572|UCharacter.hasBinaryProperty(UProperty.EMOJI);|code-block|syntax|javascript|1093573|记住要保持icu4j的最新版本，注意这只会过滤掉官方的Unicode表情符号，而不是符号字符。结合过滤其他字符类型，按需要。|1093574|更多信息：http://icu-project.org/apiref/icu4j/com/ibm/icu/lang/UProperty.html#EMOJI|offset|length|1093575|entityMap|0|LINK|mutability|MUTABLE|url|http://icu-project.org/apiref/icu4j/com/ibm/icu/lang/UProperty.html#EMOJI^0|0|0|0|5|21|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|V|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|W|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|X|8|@]|9|@$K|Y|L|Z|1|10]]|A|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

ICU4J is your friend.

<pre><code>UCharacter.hasBinaryProperty(UProperty.EMOJI);
</code></pre>

Remember to keep your version of icu4j up to date and note this will only filter out official Unicode emoji, not symbol characters. Combine with filtering out other character types as desired.

More information:
<a href="http://icu-project.org/apiref/icu4j/com/ibm/icu/lang/UProperty.html#EMOJI" rel="noreferrer">http://icu-project.org/apiref/icu4j/com/ibm/icu/lang/UProperty.html#EMOJI</a>

blocks|key|1093584|text|使用一个名为的jQuery插件。下面是它的工作原理：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1093585|$('#text').remove('emoji').fast()|code-block|syntax|javascript|1093586|这是一种快速模式，因为它使用启发式算法在文本中查找表情符号，因此可能会遗漏一些表情符号。使用.full()方法扫描整个字符串并删除所有保证的表情符号。|offset|length|style|CODE|1093587|entityMap^0|0|0|1A|7|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Use a jQuery plugin called RM-Emoji. Here's how it works:

<pre><code>$('#text').remove('emoji').fast()
</code></pre>

This is the fast mode that may miss some emojis as it uses heuristic algorithms for finding emojis in text. Use the <code>.full()</code> method to scan entire string and remove all emojis guaranteed.

blocks|key|1093601|text|试试这个项目简单表情-4J|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1093602|与Emoji+12.0兼容(2018.10.15)|1093603|简单易懂：|1093604|EmojiUtils.removeEmoji(str)|code-block|syntax|javascript|1093605|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/liheyuan/simple-emoji-4j^0|6|7|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|C|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|C|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Try this project <a href="https://github.com/liheyuan/simple-emoji-4j" rel="nofollow noreferrer">simple-emoji-4j</a>

Compatible with Emoji 12.0 (2018.10.15)

Simple with:

<pre><code>EmojiUtils.removeEmoji(str)
</code></pre>

I have some strings with all kinds of different emojis/images/signs in them.

Not all the strings are in English -- some of them are in other non-Latin languages, for example:

<pre class="lang-none prettyprint-override"><code>▓ railway??
→ Cats and dogs
I'm on 
Apples ⚛ 
✅ Vi sign
♛ I'm the king ♛ 
Corée ♦ du Nord ☁ (French)
 gjør at både ◄╗ (Norwegian)
Star me ★
Star ⭐ once more
早上好 ♛ (Chinese)
Καλημέρα ✂ (Greek)
another ✓ sign ✓
добрай раніцы ✪ (Belarus)
◄ शुभ प्रभात ◄ (Hindi)
✪ ✰ ❈ ❧ Let's get together ★. We shall meet at 12/10/2018 10:00 AM at Tony's.❉
</code></pre>

...and many more of these.

I would like to get rid of all these signs/images and to keep only the letters (and punctuation) in the different languages. 

I tried to clean the signs using the <a href="https://github.com/vdurmont/emoji-java" rel="noreferrer">EmojiParser library</a>:

<pre><code>String withoutEmojis = EmojiParser.removeAllEmojis(input);
</code></pre>

The problem is that EmojiParser is not able to remove the majority of the signs. The ♦ sign is the only one I found till now that it removed.
Other signs such as ✪ ❉ ★ ✰ ❈ ❧ ✂ ❋ ⓡ ✿ ♛ are not removed.

Is there a way to remove all these signs from the input strings and keeping only the letters and punctuation in the different languages?

Remove ✅, , ✈ , ♛ and other such emojis/images/signs from Java strings

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我有一些字符串，里面有各种不同的表情/图像/符号。并不是所有的字符串都用英语--其中一些是用其他非拉丁语言，例如：▓ railway??→ Cats and dogsI'm on Apples ⚛ ✅ Vi sign♛ I'm the king ♛ Corée ♦ du Nord ☁  (French) gjør at...

问从Java字符串中删除✅，，✈，♛和其他类似的表情/图像/符号
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