判断字符串中有多少个中文的工具类

public class ChineseNumFromStrUtil {
public static int getChineseNumFromStrUtil(String str) {
int count = 0;
String regEx = "[\\u4e00-\\u9fa5]";
Pattern p = Pattern.compile(regEx);
Matcher m = p.matcher(str);
while (m.find()) {
for (int i = 0; i <= m.groupCount(); i++) {
count = count + 1;
}
}
return count;
}
}