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perl file extension

inkedinked Posts: 2Member
hi all, just a little problem, have this code that checks the format of a file name:
[code]
if($file !~ m/^[a-zA-Z_](w{1,7})?/)
{
die("Incorrect format!
");
}
[code]

this checks for a filename that starts with an underscore or letter character.
It then goes on to check for a further 7 characters.
The file extension however should be optional, so if the user doesnt enter .txt, it is added to the filename by perl.
Can anyone provide me with a hint or point me in the right direction on how i would achieve this, thanx

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