I have added function code in my WordPress for copy text, what I need now is to limit the word count to my desired range for copied text, no matter how much long paragraphs user copies.

Here is the current code :

function add_copyright_text() {
    if (is_single()) { ?>
 
<script type='text/javascript'>
function addLink() {
    if (
window.getSelection().containsNode(
document.getElementsByClassName('entry-content')[0], true)) {
    var body_element = document.getElementsByTagName('body')[0];
    var selection;
    selection = window.getSelection();
    var oldselection = selection
    var beforepagelink = "Before Text: "
    var pagelink = "<?php the_title(); ?> <br /><br /><a href='<?php echo wp_get_shortlink(get_the_ID()); ?>'><?php echo wp_get_shortlink(get_the_ID()); ?></a><br />Source: Jamkhed Times"; //Change this if you like
    var afterpagelink = "<br /><br /> after text";
    var copy_text = beforepagelink + selection + pagelink + afterpagelink;
    var new_div = document.createElement('div');
    new_div.style.left='-99999px';
    new_div.style.position='absolute';
 
    body_element.appendChild(new_div );
    new_div.innerHTML = copy_text ;
    selection.selectAllChildren(new_div );
    window.setTimeout(function() {
        body_element.removeChild(new_div );
    },0);
}
}
 
 
document.oncopy = addLink;
</script>
 
<?php
}
}
 
add_action( 'wp_head', 'add_copyright_text');

If anyone can suggest me an update then it will make my day! Thanks!!