匹配定界符管道之间的文本，将其删除并保持定界符完整

Question

My issue is I have a String with a delimiter after every four characters. I need to match a specific word to those four characters between the delimiters and remove it.

Eg: String txt = "ABCD|BABA|SSRV|LKGD"

Now check the String for BABA, DGHT, LKGD, ADKC and return the String minus these items

Since we found a match for BABA and LKGD. So the result should be the following

Result: txt = "ABCD|SSRV"

Any efficient way to do it?

Answer 1

You can use:

String str = "ABCD|BABA|SSRV|LKGD";
String repl = str.replaceFirst("\\|BABA(?=\\||$)", "");
//=> ABCD|SSRV|LKGD

To remove both search strings together:

String str = "ABCD|BABA|SSRV|LKGD";
String repl = str.replaceAll("\\|(BABA|LKGD)(?=\\||$)", "");
//=> ABCD|SSRV

Answer 2

uses guava, but is quite readable.

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import com.google.common.base.Joiner;

public class test {
    public static void main(String... args) {

        String txt = "ABCD|BABA|SSRV|LKGD";
        List<String> toBeRemoved = Arrays.asList(new String[] { "BABA", "DGHT","LKGD", "ADKC" });
        List<String> data = new ArrayList<>(Arrays.asList(txt.split("\\|")));
        data.removeAll(toBeRemoved);
        System.out.println(Joiner.on("|").join(data));

    }

}