找到某个单词后，在另一个单词之前添加单词

Question

我想在字符串的每个“ from”前面添加“ count（*）”。

给出：Select thing1, thing2 from table;

输出：Select thing1, thing2, count (*) from table;

我尝试了这个，但是没有用：

String a = “ Select thing1, thing2 from table;”

String[] b = “form”.split(“\\s”)

For(string string: b){
If(a.contains(form)


}

Answer 1

尝试一下：

int idx = a.indexOf("from");
System.out.println(a.substring(0, idx-1) + ", count(*) " + a.substring(idx));

输出：

Select thing1, thing2, count(*) from table;