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The classes that start with a back slash - such as \w lose their meaning in inside 
Thus [\w] is not the same as \w. [\w] is not [0-9a-zA-Z]
If you need to combine \w with other characters (lets say a <) you need to use [0-9a-zA-Z<]
[\w] should match the \ and 'w'.
This is broken in Kregexpeditor as of 3.5.5-3
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