Java查找字符串中间字符串

Question

I am very stuck. I use this format to read a player's name in a string, like so:

"[PLAYER_yourname]"

I have tried for a few hours and can't figure out how to read only the part after the '_' and before the ']' to get there name.

Could I have some help? I played around with sub strings, splitting, some regex and no luck. Thanks! :)

BTW: This question is different, if I split by _ I don't know how to stop at the second bracket, as I have other string lines past the second bracket. Thanks!

Answer 1

You can do:

String s = "[PLAYER_yourname]";
String name = s.substring(s.indexOf("_") + 1, s.lastIndexOf("]"));

Answer 2

You can use a substring. int x = str.indexOf('_') gives you the character where the '_' is found and int y = str.lastIndexOF(']') gives you the character where the ']' is found. Then you can do str.substring(x + 1, y) and that will give you the string from after the symbol until the end of the word, not including the closing bracket.

Answer 3

Using the regex matcher functions you could do:

String s = "[PLAYER_yourname]";
String p = "\\[[A-Z]+_(.+)\\]";

Pattern r = Pattern.compile(p);
Matcher m = r.matcher(s);

if (m.find( ))
   System.out.println(m.group(1));

Result:

yourname

Explanation:

\[ matches the character [ literally

[A-Z]+ match a single character (case sensitive + between one and unlimited times)

_ matches the character _ literally

1st Capturing group (.+) matches any character (except newline)

\] matches the character ] literally

Answer 4

This solution uses Java regex

String player = "[PLAYER_yourname]";
Pattern PLAYER_PATTERN = Pattern.compile("^\\[PLAYER_(.*?)]$");
Matcher matcher = PLAYER_PATTERN.matcher(player);
if (matcher.matches()) {
  System.out.println( matcher.group(1) );
}

// prints yourname

see DEMO

Answer 5

You can do like this -

public static void main(String[] args) throws InterruptedException {
        String s = "[PLAYER_yourname]";
        System.out.println(s.split("[_\\]]")[1]);
    }

output: yourname

Answer 6

Try:

Pattern pattern = Pattern.compile(".*?_([^\\]]+)");
Matcher m = pattern.matcher("[PLAYER_yourname]");
if (m.matches()) {
  String name = m.group(1);
  // name = "yourname"
}