Reverse character formation in indesign

Question

So what I'm doing right now is surfing the text to find the following mark for footnotes: .15 and I'd like to change it to 15. where 15 becomes superscript. Is there a way to do this using a keybind and possibly GREP? I can apply a new paragraph style that involves grep, just not sure how to make it swap the locations. Also, I can't auto-search this, because there's other instances where .15 shouldn't be swapped. So I just wanna select the format .number and have that selection swap to number. and change number to superscript.

Answer 1

Slighty modified:

#target indesign
app.findGrepPreferences = app.changeGrepPreferences = null;
app.findGrepPreferences.findWhat = "(\\.)(\\d+)";
app.changeGrepPreferences.changeTo = "$2$1";
var 
    mTarget = app.activeDocument,
    mFound = mTarget.findGrep(),
    cText;
//
while (cText = mFound.pop())
    if (checkCondition(cText)) 
        doJob(cText);

alert ("No more found. Done.");
app.findGrepPreferences = app.changeGrepPreferences = null;
//
function checkCondition (testText) {
    if (testText.appliedParagraphStyle.name == "pstyle")
    return true;
    else return false;
    }
function doJob (testText) {
    testText.showText();
    if (!confirm("Replace?")) return;
    testText.changeGrep();
    testText.characters.itemByRange(0,-2).position = Position.SUPERSCRIPT;
    }

It is asking before change ("No" means go to next).

Watch condition set ==> applied paraStyle.name == "pstyle"