Regular Expressions
Regular expression literals are objects of type Regexp. They are created explicitly by calling Regexp.new or implicitly by using the literal forms, /_pattern_/ and %r{_pattern_}. The %r construct is a form of general delimited input as described in General Delimited Input.
options is one or more of i (case insensitive), o (substitute once), m (matches newline), and x (allow spaces and comments). You can additionally override the default encoding of the pattern with n (no encoding-ASCII), e (EUC), s (Shift_JIS), or u (UTF-8).
Within a regular expression, each entry in the following table matches the characters described in its description. ...
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