How to get file name from content-disposition

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Here is how I used it sometime back.
I’m assuming you are providing the attachment as a server response.

I set the response header like this from my REST service response.setHeader("Content-Disposition", "attachment;filename=XYZ.csv");

function(response, status, xhr){
    var filename = "";
    var disposition = xhr.getResponseHeader('Content-Disposition');
    if (disposition && disposition.indexOf('attachment') !== -1) {
        var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
        var matches = filenameRegex.exec(disposition);
        if (matches != null && matches[1]) { 
          filename = matches[1].replace(/['"]/g, '');
        }
    }
}

EDIT:
Editing the answer to suit your question- use of the word inline instead of attachment

function(response, status, xhr){
    var filename = "";
    var disposition = xhr.getResponseHeader('Content-Disposition');
    if (disposition && disposition.indexOf('inline') !== -1) {
        var filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/;
        var matches = filenameRegex.exec(disposition);
        if (matches != null && matches[1]) { 
          filename = matches[1].replace(/['"]/g, '');
        }
    }
}

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