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TinyMCE custom plugin, how to make a word automatically selected based on current cursor position?

Solution:

You can do it like below

if (editor.selection.isCollapsed()) {
    var selRng = editor.selection.getRng();
    selRng.expand("word"); //expands the DOM range to the current word
    editor.selection.setRng(selRng);
}

Below is a JS Fiddle for the same

https://jsfiddle.net/t9qhmguo/