Bug #10624 » regexp-space.patch
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* <tt>/\D/</tt> - A non-digit character (<tt>[^0-9]</tt>)
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* <tt>/\h/</tt> - A hexdigit character (<tt>[0-9a-fA-F]</tt>)
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* <tt>/\H/</tt> - A non-hexdigit character (<tt>[^0-9a-fA-F]</tt>)
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* <tt>/\s/</tt> - A whitespace character: <tt>/[ \t\r\n\f]/</tt>
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* <tt>/\S/</tt> - A non-whitespace character: <tt>/[^ \t\r\n\f]/</tt>
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* <tt>/\s/</tt> - A whitespace character: <tt>/[ \t\r\n\f\v]/</tt>
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* <tt>/\S/</tt> - A non-whitespace character: <tt>/[^ \t\r\n\f\v]/</tt>
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POSIX <i>bracket expressions</i> are also similar to character classes.
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They provide a portable alternative to the above, with the added benefit
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