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    Grouping

    Grouping
    SequenceDescription
    (...)Group a regular expression to override default operator precedence.
    (?r-s:pattern) Apply option r and omit option s while interpreting pattern. Options may be zero or more of the characters i, s, or x.
    Options
    OptionDescription
    iCase insensitive.
    -iCase sensitive.
    sAlters the meaning of '.' to match any character whatsoever.
    -s"lters the meaning of '.' to match any character except '\n'.
    xIgnores comments and whitespace in patterns. Whitespace is ignored unless it is backslash-escaped, contained within ""s, or appears inside a character range.
    These options can be applied globally at the rules level by passing a combination of the bit flags to the lexer.
    (?# comment )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.

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