$loc = index($string, $substr); # returns in $loc the location (first character in $string is location 0) of first occurrence of $substr in $string.
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If $substr is not found, index returns -1
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$loc = index($string, $substr, $firstloc); # returns $loc which is at least as large as $firstloc
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Use to find multiple occurrences, setting $firstloc as 1+ previously found location
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rindex($string, $substr, $lastloc) is identical to index except scanning starts at right (end) of string and not at start. All locations still count from left but if you give a third argument $lastloc, the returned $loc will be at most $lastloc
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