替换字符串中的特殊字符

Question

I have a String str =\\'abc\\' which I am printing. Its printing like \\'abc'\\ instead of 'abc' .

I have tried this option: str.replaceAll("\\\\", ""); but its giving me java.util.regex.PatternSyntaxException: Unexpected internal error near index 1

Can anyone help resolve this issue.

Answer 1

Why are you using regex you can do:

str = str.replace("\\", ""); 

If you have to use regex then you need to use:

str = str.replace("\\\\", ""); 

regex needs double escaping in Java since String and regex engine bot needs escaping.

Answer 2

Your method:

private static String getNewString(String str) { 
      str.replaceAll("\\\\", ""); 
      System.out.println("The updated String : "+str); 
      return str; 
}

will return the initial string, since string is immutable. str.replaceAll will leave str as it is and it will generate a new string.

Change your test case to this:

    public static void main(String ...string) { 
        String str = "\\'a\\'"; 
        System.out.println("The original String : "+str); 
        str = getNewString(str); 
    } 

    private static String getNewString(String str) { 
        String rez = str.replaceAll("\\\\", ""); 
        System.out.println("The updated String : "+rez); 
        return rez; 
    } 

Answer 3

i think you mean :

public class Abc {

public static void main(String[] args) {


    String str ="\'abc\'";

    System.out.println(str);

}

}

output : 'abc'

it is coming correct for me.