Is it implied by default in str.scan? Is it off by default in str[regex] ?
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2 Answers
Yes, how often the regex is applied depends on the method used, not on the regex's flags.
scan will return an array containing (or iterate over) all matches of the regex. match and String#[] will return the first match. =~ will return the index of the first match. gsub will replace all occurrences of the regex and sub will replace the first occurence.
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smotchkkiss:~$ irb
>> 'Foobar does not like food because he is a fool'.gsub(/foo/i, 'zim')
=> "zimbar does not like zimd because he is a ziml"
