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Regex + html problem

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I’m using some regex to fish out external CSS for html. In Patterns the regex works fine:

In Xojo with the following code:

dim html as String = backen

dim theRegex as new RegEx
theRegex.options.greedy = False
theRegex.Options.TreatTargetAsOneLine = True
theRegex.Options.DotMatchAll = True

'remove external css
theRegex.searchPattern = "(?i)<link[^>]+href\s*=\s*['""](.*?css.*?)['""][^>]*>"
theRegex.ReplacementPattern = ""
Html = theRegex.Replace(html)

me.LoadPage(html, nil)

almost all html is removed:

Partial html:

Neuer Beitrag "Saftige Mandelhörnchen mit Marzipan"

What is wrong with the Xojo code?

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