Bug #7062 ยป rdoc_for_string_match.patch
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* <i>obj.=~</i>, passing <i>str</i> as an argument. The default
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* <code>=~</code> in <code>Object</code> returns <code>nil</code>.
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*
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* Note: <code>str =~ regexp</code> is not the same as
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* <code>regexp =~ str</code>. Strings captured from named capture groups
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* are not assigned to local variables in the first case.
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*
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* "cat o' 9 tails" =~ /\d/ #=> 7
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* "cat o' 9 tails" =~ 9 #=> nil
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*/
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