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2.  alnum  Any alphanumeric character ("[A-Za-z0-9]").

my $re = qr{
    \A                    # Assert start of string
...
    )
    \z                    # Assert end of string
}x;

my $re = qr{
    \A                         # Assert start of string
...
    )
    \z                         # Assert end of string
}xx;