Relink images to similar file names

Hi Eugene, another approach would be to unembed the emedded links, rename them and relink to the renamed files. This asks for a link folder and unembeds 

var f = Folder.selectDialog("Select the links folder");
var lks = app.documents[0].links;
var n, nn;

for (var i = 0; i < lks.length; i++){
    if (lks[i].status == LinkStatus.LINK_EMBEDDED) {
        n = lks[i].name;
        nn = lks[i].name.replace(/_\d+(\.[^\.]+)$/, n.substring(n.length-4))
        lks[i].unembed(f);
        File(lks[i].filePath).rename(nn);
        lks[i].relink(File(f+"/"+nn))
    } 
};   

Hi @Eugene Tyson,

Edit: I made a small change to the script to accommodate Eugene's reply below.

Please try this script: (it's based on my relinker script)

function main() {

    updateLinks(app.activeDocument);

    function updateLinks(doc) {
        var links = doc.links,
            counter = 0,
            findWhat = /_\d+(\.[^\.]+)$/,
            changeTo = '$1';

        for (var i = 0; i < links.length; i++) {

            // ignore normal links
            if (links[i].status === LinkStatus.NORMAL) continue;

            // new file by replacing text within file path
            var newLinkedFile = File(links[i].filePath.replace(findWhat, changeTo));

            // if file exists at the new file path, relink
            if (newLinkedFile.exists) {
                links[i].relink(newLinkedFile);
                counter++;
            }
        }

        alert('Relinked ' + counter + ' out of ' + links.length + ' links.');
    }

} // end main

app.doScript(main, ScriptLanguage.JAVASCRIPT, undefined, UndoModes.ENTIRE_SCRIPT, 'Update Links');

This script will iterate over all the links in the active document and, if it's missing, will try to remove underscore and digits from the filename and then, if that new filename exists, it will relink to that file. Note that this will "Unembed" embedded links.

- Mark