Description:
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In a pattern parsed by preg_match, the 'backslash-w' meta-character (which is described as matches 'any "word" character') matches digits as well (i.e. [0-9]). This is true inside and outside of square-brackets.



Reproduce code:
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$subject = "12345";
$result = preg_match('/\w+/i', $subject);
echo "\w result: $result <br />";
$result = preg_match('/[a-z]+/i', $subject);
echo "[a-z] result: $result <br />";



Expected result:
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\w result: 0
[a-z] result: 0 

Actual result:
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\w result: 1
[a-z] result: 0