Improve doc of Regexp about "ignore case" behavior [Misc #10836]

* doc/regexp.rdoc: RDoc for "ignore case" behavior

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65269 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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aycabta 2018-10-21 06:42:53 +00:00
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@ -541,10 +541,15 @@ options which control how the pattern can match.
subexpression level with the
<tt>(?</tt><i>on</i><tt>-</tt><i>off</i><tt>)</tt> construct, which
enables options <i>on</i>, and disables options <i>off</i> for the
expression enclosed by the parentheses.
expression enclosed by the parentheses:
/a(?i:b)c/.match('aBc') #=> #<MatchData "aBc">
/a(?i:b)c/.match('abc') #=> #<MatchData "abc">
/a(?i:b)c/.match('aBc') #=> #<MatchData "aBc">
/a(?-i:b)c/i.match('ABC') #=> nil
Additionally, these options can also be toggled for the remainder of the
pattern:
/a(?i)bc/.match('abC') #=> #<MatchData "abC">
Options may also be used with <tt>Regexp.new</tt>: