Is there any pdf reader that supports word searching with regular expression?

Windows

With regex search:

• PDF Search
• PDF Manager
• dnGREP (Free and Open Source)
• FileLocator Pro or Agent Ransack
• PowerGrep

Without regex search:

• Adobe PDF iFilter
• PDFSearcher
• PDF Explorer
• Sumatra PDF (sources) (Free and Open Source)
• File Search Assistant (FSA)
• Foxit Reader + IFilter (or other FoxIt softwares)
• Okular (free and open source multiple platforms universal document viewer developed by KDE)

Other:

• grepWin, it supports regex, but doesn't support PDF files yet.

Linux

Without regex search:

• pdfgrep (no GUI, available via apt-get) (Free and Open Source)

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Related question: Is there software to allow me to search a PDF file with Regex?