Bug #4292 ยป string_rdoc.patch
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* against <i>str</i>,and returns the position the match starts, or
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* <code>nil</code> if there is no match. Otherwise, invokes
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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>false</code>.
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* <code>=~</code> in <code>Object</code> returns <code>nil</code>.
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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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