Delete all markers starting with "Part No" and type "Index"

#target framemaker

var doc, marker, nextMarker, regex;

// Set a variable for the active document.
doc = app.ActiveDoc;
// Make a regular expression for the text.
regex = /^Part No\./;

// Process all of the markers in the document.
marker = doc.FirstMarkerInDoc;
while (marker.ObjectValid () === 1) {
    nextMarker = marker.NextMarkerInDoc;
    // Make sure it is an Index marker.
    if (marker.MarkerTypeId.Name === "Index") {
        // Check the text.
        if (regex.test (marker.MarkerText) === true) {
            marker.Delete ();
        }
    }
    marker = nextMarker;
}