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    2.  alnum  Any alphanumeric character ("[A-Za-z0-9]").
    
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    my $re = qr{
        \A                    # Assert start of string
    ...
        )
        \z                    # Assert end of string
    }x;
    
  3. or download this
    my $re = qr{
        \A                         # Assert start of string
    ...
        )
        \z                         # Assert end of string
    }xx;