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<h2 class="title">Character classes</h2>
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<caption><strong>Character classes</strong></caption>
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<th>Sequence</th><th>Description</th>
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<td>[...]</td><td>A single character listed or contained within a listed range. Ranges can be combined with the <em>{+}</em> and <em>{-}</em> operators. For example <em>[a-z]{+}[0-9]</em> is the same as <em>[0-9a-z]</em> and <em>[a-z]{-}[aeiou]</em> is the same as <em>[b-df-hj-np-tv-z]</em>.</td>
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<td>[^...]</td><td>A single character not listed and not contained within a listed range.</td>
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<td>.</td><td>Any character, default <em>[^\n].</em></td>
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<td>\d</td><td>Digit character, <em>[0-9]</em>.</td>
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<td>\D</td><td>Non-digit character, <em>[^0-9]</em>.</td>
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<td>\s</td><td>White space character, <em>[ \t\n\r\f\v]</em>.</td>
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<td>\S</td><td>Non-white space character, <em>[^ \t\n\r\f\v]</em>.</td>
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<td>\w</td><td>Word caracter, <em>[a-zA-Z0-9_]</em>.</td>
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<td>\W</td><td>Non-word caracter, <em>[^a-zA-Z0-9_]</em>.</td>
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