URL REWRITE

Hej,
Jeg har oprettet samme spørgsmål i kategorien .net, men tror egentlig at den hører hjemme her.

Jeg har købt det her system der skriver url-adresserne om til nogle mere brugebare.
Men den laver ikke æ, ø og å om, men fjerner dem bare.
Jeg vil gerne have dem lavet til:
ø = 'oe'
æ = 'ae'
å = 'aa'

Men jeg ved ikke hvordan jeg skal kode det, men tror at det er reg.exp.

I kan se koden her:

        <urlrewrites>
            <rule url="/skin-([\w-]+)\.aspx(?:\?(.*))?" rewrite="/default.aspx?SkinID=$1&amp;$2" />
            <rule url="/e-(.*?)\.aspx(?:\?(.*))?" rewrite="/engine.aspx?XmlPackage=$1&amp;$2" />
            <rule url="./locale-([\w-]+)\.aspx(?:\?(.*))?" rewrite="/setlocale.aspx?LocaleSetting=$1&amp;$2" />
            <rule url="/t-([\w-]+)\.aspx(?:\?(.*))?" rewrite="/driver.aspx?Topic=$1&amp;$2" />
            <rule url="/t2-([\w-]+)\.aspx(?:\?(.*))?" rewrite="/driver2.aspx?Topic=$1&amp;$2" />
            <rule url="/tp-([\w-]+)\.aspx(?:\?(.*))?" rewrite="/driverpopup.aspx?Topic=$1&amp;$2" />
            <rule url="/c-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showcategory.aspx?CategoryID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/d-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showdistributor.aspx?DistributorID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/g-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showgenre.aspx?GenreID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/v-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showvector.aspx?VectorID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/s-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showsection.aspx?SectionID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/m-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showmanufacturer.aspx?ManufacturerID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/p-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showproduct.aspx?ProductID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/pc-([0-9]*)-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showproduct.aspx?ProductID=$1&amp;CategoryID=$2&amp;SEName=$3&amp;$4" />
            <rule url="/pd-([0-9]*)-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showproduct.aspx?ProductID=$1&amp;DistributorID=$2&amp;SEName=$3&amp;$4" />
            <rule url="/ps-([0-9]*)-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showproduct.aspx?ProductID=$1&amp;SectionID=$2&amp;SEName=$3&amp;$4" />
            <rule url="/pm-([0-9]*)-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showproduct.aspx?ProductID=$1&amp;ManufacturerID=$2&amp;SEName=$3&amp;$4" />
            <rule url="/dl-([0-9]*)-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showdocument.aspx?DocumentID=$1&amp;LibraryID=$2&amp;SEName=$3&amp;$4" />
            <rule url="/l-([0-9]*)-([\w-]*)\.aspx(?:\?(.*))?" rewrite="/showlibrary.aspx?LibraryID=$1&amp;SEName=$2&amp;$3" />
            <rule url="/x-(.*?)\.aspx(?:\?(.*))?" rewrite="/execpackage.aspx?XmlPackage=$1&amp;$2" />
        </urlrewrites>


Håber virkelig at der er nogen som kan/vil hjælpe mig med at få det kodet.