Java string.replace(old, new) 算多少个被替换？

Question

我有我的控制台(下图)，我有一个命令可以将所有 oldstinrg 替换为 newstring。但我如何计算其中有多少被替换？

(如果代码只将 a 替换为 b 一次，则值为 1，但如果将 a 替换为 b 两次，则值为 2)

(这只是一部分代码，不需要其他部分或与这部分代码有任何关系)

else if(intext.startsWith("replace ")){


                String[] replist = original.split(" +");    

                String repfrom = replist[1];
                String repto = replist[2];

                lastorep = repfrom;
                lasttorep = repto;

                String outtext = output.getText();
                String newtext = outtext.replace(repfrom, repto);
                output.setText(newtext);

                int totalreplaced = 0; //how to get how many replaced strings were there?

                message("Total replaced: " + totalreplaced + " from " + repfrom + " to " + repto);

            }

Answer 1

您可以使用 String.replaceFirst 并自己计算:

String outtext = output.getText();
String newtext = outtext;
int totalreplaced = 0;

//check if there is anything to replace
while( !newtext.replaceFirst(repfrom, repto).equals(newtext) ) {
    newtext = newtext.replaceFirst(repfrom, repto);
    totalreplaced++;
}

message("Total replaced: " + totalreplaced + " from " + repfrom + " to " + repto);