🚀 go-pugleaf

Does this work?

myIndex = app.selection[0].parentStory 
setupFindGrep("\\d+") 
myFinds = myIndex.findGrep(); 
for (var j = myFinds.length - 1; j >= 0; j--) { 
  myFinds[j].contents = String(Number(myFinds[j].contents) + 10) 
}

function setupFindGrep(find, change, foots, hidLayers, lockedLayers, lockedStories, masters) { 
  app.findGrepPreferences = null; 
  app.changeGrepPreferences = null; 
  try { app.findGrepPreferences.findWhat = find } catch(e) {}; 
  try {app.changeGrepPreferences.changeTo = change } catch(e) {}; 
  app.findChangeGrepOptions.properties = { 
    includeFootnotes:(foots == null ? false : foots), 
    includeHiddenLayers:(hidLayers == null ? false : hidLayers), 
    includeLockedLayersForFind:(lockedLayers == null ? false : lockedLayers), 
    includeLockedStoriesForFind:(lockedStories == null ? false : lockedStories), 
    includeMasterPages:(masters == null ? false : masters) 
  } 
} // end setupFindGrep

Be warned that I just wrote this here and haven't tested it. The function works correctly; that I lifted from my library of text snippets.

Dave