回答編集履歴
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answer
CHANGED
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@@ -1,6 +1,6 @@
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1
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```php
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2
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<?php
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3
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-
$alphanumdashunder = "/^[-_a-zA-Z0-9]{3,
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3
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+
$alphanumdashunder = "/^[-_a-zA-Z0-9]{3,15}$/";
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4
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$containsAlphaNum = "/.*[0-9a-zA-Z].*/";
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5
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$subject = "---";
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6
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var_dump(preg_match ( $alphanumdashunder , $subject ) && preg_match ( $containsAlphaNum , $subject ));
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