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Java program to remove all numbers in a string except "1" and "2"?
The regular expression "(?<!\d)digit(?!\d)" matches the digit specified.
The replaceAll() method accepts two strings: a regular expression pattern and, the replacement string and replaces the pattern with the specified string.
Therefore, to remove all numbers in a string except 1 and 2, replace the regular expressions 1 and 2 with one and two respectively and replace all the other digits with an empty string.
Example
import java.util.Scanner; public class RegexExample { public static void main(String args[]) { //Reading String from user System.out.println("Enter a String"); Scanner sc = new Scanner(System.in); String input = sc.nextLine(); //Regular expression to match the digit 1 String regex1 = "(?<!\d)1(?!\d)"; //Regular expression to match the digit 2 String regex2 = "(?<!\d)2(?!\d)"; //Replacing all space characters with single space String result = input.replaceAll(regex1, "one") .replaceAll(regex2, "two") .replaceAll("\s*\d+", ""); System.out.print("Result: "+result); } }
Output
Enter a String sample 1 2 3 4 5 6 Result: sample one two
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