Description:
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preg_match finds a wrong match with these params:
pattern "(?=.*?[A-Za-z]).{8,}",
subject "вasdaв". Last contains 6 chars (english and russian), but regex pattern must accept only 8+ chars.

Test script:
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$out = array();
preg_match("/(?=.*?[A-Za-z]).{8,}/", "вasdaв", $out);
var_dump($out);

Expected result:
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array(0) { }

Actual result:
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array(1) { [0]=> string(8) "вasdaв" }