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  1. Prepare
  2. Java
  3. Strings
  4. Java Regex
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Java Regex

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668 Discussions

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  • hilan_paganini
     + 0 comments
    class MyRegex{
    String from0to199 = "[0-1]?[0-9]?[0-9]";
    String from200to249 = "2[0-4][0-9]";
    String from250to255 = "25[0-5]";
    String from0to255 = "(" + from0to199 + "|" + from200to249 + "|" + from250to255 + ")";
    String dot = "\\.";
    String pattern = from0to255 + dot + from0to255 + dot + from0to255 + dot + from0to255;
}

  • Damian_GDO_92
     + 0 comments
    import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.Scanner;

class Solution{

    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        while(in.hasNext()){
            String IP = in.next();
            System.out.println(IP.matches(new MyRegex().pattern));
        }

    }
}

class MyRegex{
    static final String pattern = 
        "((([0-1]?[0-9]{1,2})|(2[0-4][0-9])|(25[0-5])).){3}(([0-1]?[0-9]{1,2})|(2[0-4][0-9])|(25[0-5]))";
}

  • tony_hano
     + 0 comments

    here is my code without regex in java

    import java.io.; import java.util.;

    public class Solution {

    public static void main(String[] args) throws IOException{
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

    String input = reader.readLine(); while (input != null){ System.out.println(MyRegex.checkIP (input)); input = reader.readLine(); } }

    }

    class MyRegex { public static boolean checkIP (String input) { int startNum = 0 ; for (int i=1 ; i < 5 ; i++){ int currentDot = input.indexOf(".", startNum);

      if (currentDot == -1 && i != 4){return false ;}
 int currentNum ;
 try {
    if (currentDot == -1) {currentDot = input.length();}
     currentNum = (int) Integer.parseInt(input.substring(startNum, currentDot));

if (currentNum > 255) {return false;}
 if (input.substring(startNum, currentDot).length() > 3 || input.substring(startNum, currentDot).length() == 0) {return false;} 
 if (input.contains(" ")){return false;}
}     
 catch (Exception e){
    return false ;
 }
 startNum = currentDot + 1;
 if (i == 3 && input.indexOf(".", startNum) > 0){return false ;}

    } return true; }
    }

  • dalavaiabhilash1
     + 0 comments

    import java.util.Scanner;

    public class Solution { public static void main(String[] args) { Scanner scan = new Scanner(System.in); while (scan.hasNext()) { System.out.println(new MyRegex(scan.nextLine()).isValidIp()); } scan.close(); } }

    final class MyRegex { private final String val; private static final String IP_REG_PATTERN_STRING = "((25[0-5]|2[0-4][0-9]|[0-1]?[0-9]?[0-9])\.){3}" + "(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]?[0-9])";

    public MyRegex(String val) {
    this.val = val;
}

public boolean isValidIp() {
    return this.val.matches(IP_REG_PATTERN_STRING);
}

    }

  • bhavuksharma767
     + 0 comments

    String regex = "^(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})\.(25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})$";