问在java中提取已知模式的子字符串

EN

import java.util.regex.Matcher;
import java.util.regex.Pattern;

...

Matcher matcher = Pattern.compile("(US\\d+)").matcher(str1);
if (matcher.find()) {// if it matched the pattern
    String result = matcher.group(0);// the group captured by the regex
}

String[] strArray1 = str1.split(" ");
for (String item : strArray1) { // Cycle through all the pieces
    if (item.startsWith("US"))
         String target = item; // Your desired String
}