You're short many valid characters, but here goes: 

@ok = grep !/[^a-zA-Z0-9.:]/, @list;

[download]

or 

@ok = grep /^[a-zA-Z0-9.:]*\z/, @list;

[download]

In reply to Re: regex to detect any non digit and number by ikegami
in thread regex to detect any non digit and number by Anonymous Monk

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