$request->validate([
'phone' => ['nullable', 'regex:/^[0][0-9]{1,2}-{0,1}[0-9]{3,4}-{0,1}[0-9]{3,4}$/'],
]);
先頭の1桁は０固定
^(0{1}
先頭は１〜３桁 ０固定
\d{1,3}
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