public static void main(String[] args) {
String replace=“1111111111”;
String regex = “(.{3})”;
replace = replace.replaceAll(regex, "$1 ");
System.out.println(replace);
}
结果就是:111 111 111 1
public static void main(String[] args) {
String replace=“1111111111”;
String regex = “(.{3})”;
replace = replace.replaceAll(regex, "$1 ");
System.out.println(replace);
}
结果就是:111 111 111 1