An excellent piece of work. I must say that I tend to use teh non-breaking space in my HTML code, both to fill otherwise empty table cells, and for its true purpose - to insert a space between characters that I don't want wrapped over two lines - for example, writing out telephone numbers:

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Phone:  +61 2 9999 3114
Mobile: 0407 265
199

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My recommendation would be that the ascii character 0xA0 should be included in the whitespace character class (\s). Something for the Perl-5 porters?