import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main(String[] args) {
final String regex = "[^\\p{Cyrillic}\\p{Latin}\\p{Common}\\w\\s]+";
final String string = "Как защитить чат от длинных символов 123?\n"
+ "Всем здравствуйте, я хотел бы попросить у вас помощи. Дело в том, что существует так называемые символы, которые \"ломают чат\". Их длина очень большая и занимает пол чата, а то и весь. Мне очень нужно узнать, как защитить чат от этих символов. Вот пример символов: ̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿|̳̳̳̳̿̿̿̿l̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿|̳̳̳̳̿̿̿̿l̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̳̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊̿̿̿̿̊ é̴̢̢̢̧̡̧̡̢̡̧̡̡̡̨̛̛̛̥̟̹͖̲̙̪̙̠̙͍̹̦̦͇̣̯͓̯͈͔̺̺̯͚̱͔̻̖̰̖̙̟͇̘͍͉̱̟͓̞͓̘͓̟̳͕̲̞̫̱̖̗̘͇̯͎̝̹̥̲͍̥͉̳̠̥͕̗͔̟͖͇͖͓̭͖̜̱̠̳̺͚̖̿͒̾̑̌̆̀̎͋̀̈́̓̓̄̂́̃̀̈́̋̎̎͌̈́̓̃̈́̐̾̀̃̎́̈͛̽̔͊͐́͌̿̐̍̈̔̒̽̿͐̅́́̊̿̉̑̑͒̔́̓̄͊̀̋̓͛̇̍̇̈́͐͑̇̌̓̓͂̎̅͘̚̚̕͘̕̚͜͝͝͠͠͝͠͠͠ͅ.̨̡̢̢̧̧̨̨̧̢̧̛͙̟̮̩̥̻̬̱̝͔̝̼̗͖͎̪̲͓͔̝̤͖̫̳̟̪͎̳̭̞̝̣̗̝̱̱̮̠̙̟̙͖̤͔͇̩͍͙̰̭̝̫̜̺̝͓̻̱̤̲͉͙̦͕̰̣̬̣̺̖̘̘̮͈̭̫͍̻̰͍̼̤̙̩͖͇̒̌͆̔̄̔̓̏͛̉͛̈́̑̑̎̈́̑͂̾͑͆̑͂͂́̋͂̄̂̒̃̆̓̐̉̀̾̽͒̎̓͐͆͑̊̉͋͋̀̈́̓̎͛̌͌̂̽̔͆̍̊̓̽̂̆̀̿̀̋̍̃̔̉̇̎̋̈́͆̈́̚͘̚̕̚͘̕͘̚̚͘̚͝͝͠͠͝͝͝ͅͅͅ.̛̛̛̾͌͆̎̎̈̎͛͗͐̄̽̊̃̿͋͌͒̔͛̍̋̀̾̀̀̏̉͒̋́͑́͌͊̇̏̌̃̂̓̀͂̇̾͑̇̍̿̈́͂̽̈́͆͂̂̍́̂̂̾̔̍͋̓̕̚̚̕̕̕̕͝͠͠͝͝͝ Ỏ͖͈̞̩͎̻̫̫̜͉̠̫͕̭̭̫̫̹̗̹͈̼̠̖͍͚̥͈̮̼͕̠̤̯̻̥̬̗̼̳̤̳̬̪̹͚̞̼̠͕̼̠̦͚̫͔̯̹͉͉̘͎͕̼̣̝͙̱̟̹̩̟̳̦̭͉̮̖̭̣̣̞̙̗̜̺̭̻̥͚͙̝̦̲̱͉͖͉̰̦͎̫̣̼͎͍̠̮͓̹̹͉̤̰̗̙͕͇͔̱͕̭͈̳̗̭͔̘̖̺̮̜̠͖̘͓̳͕̟̠̱̫̤͓͔̘̰̲͙͍͇̙͎̣̼̗̖͙̯͉̠̟͈͍͕̪͓̝̩̦̖̹̼̠̘̮͚̟͉̺̜͍͓̯̳̱̻͕̣̳͉̻̭̭̱͍̪̩̭̺͕̺̼̥̪͖̦̟͎̻Ỏ͖͈̞̩͎̻̫̫̜͉̠̫͕̭̭̫̫̹̗̹͈̼̠̖͍͚̥͈̮̼͕̠̤̯̻̥̬̗̼̳̤̳̬̪̹͚̞̼̠͕̼̠̦͚̫͔̯̹͉͉̘͎͕̼̣̝͙̱̟̹̩̟̳̦̭͉̮̖̭̣̣̞̙̗̜̺̭̻̥͚͙̝̦̲̱͉͖͉̰̦͎̫̣̼͎͍̠̮͓̹̹͉̤̰̗̙͕͇͔̱͕̭͈̳̗̭͔̘̖̺̮̜̠͖̘͓̳͕̟̠̱̫̤͓͔̘̰̲͙͍͇̙͎̣̼̗̖͙̯͉̠̟͈͍͕̪͓̝̩̦̖̹̼̠̘̮͚̟͉̺̜͍͓̯̳̱̻͕̣̳͉̻̭̭̱͍̪̩̭̺͕̺̼̥̪͖̦̟͎̻Ỏ͖͈̞̩͎̻̫̫̜͉̠̫͕̭̭̫̫̹̗̹͈̼̠̖͍͚̥͈̮̼͕̠̤̯̻̥̬̗̼̳̤̳̬̪̹͚̞̼";
final String subst = "";
final Pattern pattern = Pattern.compile(regex, Pattern.MULTILINE | Pattern.UNICODE_CASE | Pattern.CASE_INSENSITIVE);
final Matcher matcher = pattern.matcher(string);
// The substituted value will be contained in the result variable
final String result = matcher.replaceAll(subst);
System.out.println("Substitution result: " + result);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Java, please visit: https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html