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fix typo in expr/index doc.
from kwzh
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@@ -844,7 +844,7 @@ Returns the substring of @var{string} beginning at @var{position}
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with length at most @var{length}. If either @var{position} or
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@var{length} is negative, zero, or non-numeric, returns the null string.
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@item index @var{string} @var{character-class}
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@item index @var{string} @var{charset}
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@findex index
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Returns the first position in @var{string} where the first character in
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@var{charset} was found. If no character in @var{charset} is found in
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