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How to remove non-ASCII characters from strings
The Posix character class \p{ASCII} matches the ASCII characters and the meta character ^ acts as negation.
i.e. The following expression matches all the non-ASCII characters.
"[^\p{ASCII}]"The replaceAll() method of the String class accepts a regular expression and a replacement-string and, replaces the characters of the current string (matching the given pattern) with the specified replacement-string.
Therefore, You can remove the matched characters by replacing them with the empty string “, using the replaceAll() method.
Example 1
import java.util.Scanner;
public class Exp {
public static void main( String args[] ) {
Scanner sc = new Scanner(System.in);
String regex = "[^\p{ASCII}]";
System.out.println("Enter input data:");
String input = sc.nextLine();
String result = input.replaceAll(regex, "");
System.out.println("Result: "+result);
}
}Output
Enter input data: whÿ do we fall Result: wh do we fall
Example 2
import java.util.Scanner;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Example {
public static void main( String args[] ) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter input string: ");
String input = sc.nextLine();
String regex = "[^\p{ASCII}]";
//Creating a pattern object
Pattern pattern = Pattern.compile(regex);
//Matching the compiled pattern in the String
Matcher matcher = pattern.matcher(input);
//Creating an empty string buffer
StringBuffer sb = new StringBuffer();
while (matcher.find()) {
matcher.appendReplacement(sb, "");
}
matcher.appendTail(sb);
System.out.println("Result: \n"+ sb.toString() );
}
}Output
Enter input string: whÿ do we fall Result: wh do we fall
Updated on: 21-Nov-2019
733 Views
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