Java string.replace(old, new) count how many replaced?

Question

I have my console (image down below), and I have a command that will replace all oldstinrg to newstring. But how do I count how many of those were replaced?

(If the code replaced only once a to b then it will be 1, but if it replaced a to b twice the value would be 2)

(this is just a part of code, but no other part is needed or any how related to this part of code)

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

you could use String.replaceFirst and count it yourself:

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);