Returns the index of search in subject.
| index_all | Returns an array of all occurrence index of search in subject or an empty array if not found. Case sensitive.
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| index_of | Returns the first occurrence index of search in subject or -1 if not found. Case sensitive.
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| last_index_of | Returns the last occurrence index of search in subject or -1 if not found. Case sensitive.
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| search | Returns the first index of a pattern match in subject.
NOTE: Executes regular expressions only on valid UTF-8 while exposing match locations as byte indices into the search string (see case #3).
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