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@ -403,7 +403,7 @@ class PHPExcel_Shared_String
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* @return boolean
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*/
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public static function IsUTF8($value = '') {
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return $string === '' || preg_match('/^./su', $string) === 1;
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return $value === '' || preg_match('/^./su', $value) === 1;
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}
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/**
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