从另一个字符串中删除一组非连续字符（作为字符串）？

Question

I need to generate s3 string by removing from s1 all characters appearing in s2.

For example :

String s1 = "Computer"; 
String s2 = "mur";

Result must be : "Copte"

I tried to do: s3 = s1.replace(s2, ""); but it does not work. I get the same word: computer .

Answer 1

You can use replaceAll witch accept regex :

String result = s1.replaceAll(String.format("[%s]", s2), "");// Output Copte

---

If your string contain some special characters, for example } { ) ( . - this character can be part from the regex syntax, in this case you have to escape them, you can just use Pattern.quote(s2) like this :

String result = s1.replaceAll(String.format("[%s]", Pattern.quote(s2)), "");

Answer 2

s1.replace(s2, "") works when s2 is substring of s1 . However, mur is not a substring of Computer . Since m u r are substrings of Computer , you can remove them separatly.

String s1="Computer", s2="mur";
for (char c : s2.toCharArray()) {  // create a char array [m, u, r]
    s1 = s1.replace(String.valueOf(c), "");  // remove them separatly
}
System.out.print(s1);