Java: removing numeric values from string

问题

I have suceeded with the help of this community in removing numeric values from user input, however, my code below will only retrieve the alpha characters before the numeric that has been removed:

import java.util.Scanner;

public class Assignment2_A {

    public static void main(String[] args) {
        Scanner firstname = new Scanner(System.in);
        String firstname1 = firstname.next();
        firstname1 = firstname1.replaceAll("[^A-Z]","");
        System.out.println(firstname1);
    }
}

For example if user input = S1234am, I am only getting back: S. How do I retrieve the remaining characters in the string?

回答1:

Your regular expression [^A-Z] is currently only configured to preserve upper-case letters. You could try replacing it with [^A-Za-z] to keep the lower-case letters too.

回答2:

This will remove all digits:

firstname1 = firstname1.replaceAll("\\d","");

回答3:

You can use:

firstname1 = firstname1.replaceAll("[0-9]","");

This will remove all numeric values from String firstName1.

    String firstname1 = "S1234am";
    firstname1 = firstname1.replaceAll("[0-9]","");
    System.out.println(firstname1);//Prints Sam

回答4:

How to remove numeric values from a string:

to do this it will be enough

str.replaceAll("[^A-Za-z]","");

but what if your string contain characters like:

String str = "stackoverflow elenasys +34668555555 # Пивоварова Пивоварова հայեր հայեր አማሪኮ     አማሪኮ kiểm tra kiểmtra ตรวจสอบ ตรวจสอบ التحقق من التحقق من";

most of the characters will be removed too, so this is a better option:

str = str.replaceAll("[\\d.]", "");

to remove all numeric values and get as result:

stackoverflow elenasys + # Пивоварова Пивоварова հայեր հայեր አማሪኮ     አማሪኮ kiểm tra kiểmtra ตรวจสอบ ตรวจสอบ التحقق من التحقق من

回答5:

Your regex:

[^A-Z]

matches anything which is not an uppercase letter.

Which means any lowercase letter will match too.

You should probably use:

[^A-Za-z]

as a regex instead.

Note also that this will not account for anything other than ASCII. It may, or may not, be what you want.

回答6:

public static void main(String[] args) {
    String address = "34732483dhshdsdhajsa8ejdsdd";
    char[] chars = address.toCharArray();
    String aString = "";

    for (int i = 0; i < chars.length; i++) {
        if (!Character.isDigit(chars[i])) {
            aString =aString + chars[i]; 


        }

    }System.out.println(aString);



}

回答7:

/*Remove numbers from given specific string*/
public class NewClass6 {
public static void main(String[] args){
    String s= "hello647hi74joke";
    char[] ch=s.toCharArray();
    System.out.println("Result = "+getString(ch));
 }
 static String getString(char[] ch){
   int m = 0;
   char[] chr=new char[50];
   char[] k = {'0','1','2','3','4','5','6','7','8','9'};
   for(int i = 0 ; i < ch.length ; i++){
       for(int j = 0 ; j < k.length ; j++){  
           if(ch[i]==k[j]){
               m--;
               break;
           }else{
               chr[m]=ch[i];
           }
       }
       m++;
     }
     String st = String.valueOf(chr);
     return st;
     }
    }

来源：https://stackoverflow.com/questions/17516049/java-removing-numeric-values-from-string

标签

java

string

removeall