Simple regex question

Hi,

If I have this:
my $v1 = "9"; #Needs to be "09"
my $v2 = "01"; # Okay
my $v3 = "3"; # Needs to be "03"
my $v4 = "54"; #Okay

I want to make sure that all strings have the same format, which is 2 digits (or more) but that single digit values are padded with a '0'. This is for a database query that happens later.

What is the regex to convert "1" to "01" and leaves "101" alone?
.

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