Unterschiedliches Wasserzeichen als Dateiname

Good Morning
I would like to have a script where a query of the file name makes. It does not occur with every PDF, but. If so, this would also have to be cut off as in variant 1.
Thank you in advance for your help.

Variante 1

var mm = 2.83465;

this.addWatermarkFromText({cText: "Philips Bern,  " + this.documentFileName.split("-")[0], cFont: "Arial", nFontSize: 14, aColor: color.red,

    nHorizAlign: app.constants.align.left, nVertAlign: app.constants.align.bottom, nHorizValue: mm*10, nVertValue: mm*1.5});

Variante 2

var mm = 2.83465;

this.addWatermarkFromText({cText: "Philips Bern,  " + this.documentFileName.replace(".pdf", "",  split("-")[0]), cFont: "Arial", nFontSize: 14, aColor: color.red, nHorizAlign: app.constants.align.left, nVertAlign: app.constants.align.bottom, nHorizValue: mm*10, nVertValue: mm*1.5});