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<h2 class="title">Grouping</h2>
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<caption><strong>Grouping</strong></caption>
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<th>Sequence</th><th>Description</th>
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<td>(...)</td><td>Group a regular expression to override default operator precedence.</td>
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<td style="vertical-align: top;">(?r-s:pattern)</td>
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Apply option r and omit option s while interpreting pattern. Options may be zero or more of the characters i, s, or x.
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<caption><strong>Options</strong></caption>
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<th>Option</th><th>Description</th>
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<td>i</td><td>Case insensitive.</td>
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<td>-i</td><td>Case sensitive.</td>
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<td>s</td><td>Alters the meaning of '.' to match any character whatsoever.</td>
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<td>-s</td><td>"lters the meaning of '.' to match any character except '\n'.</td>
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<td>x</td><td>Ignores comments and whitespace in patterns. Whitespace is ignored unless it is backslash-escaped, contained within ""s, or appears inside a character range.</td>
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These options can be applied globally at the rules level by passing a combination of the bit flags to the lexer.
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<td>(?# comment )</td><td>Omit everything within (). The first ) character encountered ends the pattern. It is not possible for the comment to contain a ) character. The comment may span lines.</td>
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