java 正则表达式获取值

@Test
public void testtest() {
String test = "hahahhehe sendCode\":\"12367890123rsdfsdfsdfdsahahhehe sendCode\":\"12367890123rsdfsdfsdfds";
test = PropsUtil.regMatch(test, "sendCode\":\"([\\d]{8})([\\d]{3})");

}

public static String regMatch(String withinText, String regString) {
String code = null;
Pattern pattern = Pattern.compile(regString);
Matcher matcher = pattern.matcher(withinText);
if (matcher.find()) {
matcher.reset();
while (matcher.find()) {
code = matcher.group(1);
System.err.println("aaaa" + code);
code = matcher.group(0);
System.err.println("bbbb" + code);
code = matcher.group(2);
System.err.println("ccc" + code);
}
}
return code;
}
}

运行结果

aaaa12367890
bbbbsendCode":"12367890123
bbbb123
aaaa12367890
bbbbsendCode":"12367890123
bbbb123

匹配后group(0)表示整个匹配的串

group(1)表示正则中第一个（）中表示的正则匹配值

group(2)表示正则中第二个（）中表示的正则匹配值

以此类推