Assuming the point size is always offset by spaces and is the only standalone number in the name:
var aps = app.activeDocument.allParagraphStyles;
var i = aps.length;
while(i--) {
aps[i].name = aps[i].name.replace(/ ^\d+ /g," " + aps[i].pointSize + " ");
}
This also assumes that you've already change the point size in the style. If you wanted to change the point size with a prompt it'd be:
var aps = app.activeDocument.allParagraphStyles;
var i = aps.length;
var p1 = prompt("old point size");
var p2 = prompt("new point size");
while(i--) {
if (aps[i].pointSize == Number(p1)) {
aps[i].pointSize = Number(p2);
aps[i].name = aps[i].name.replace(p1, p2);
}
}
Haven't tested yet as I have to take the kids to school
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