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) ] );

our @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } );

# h                       [0-9a-f]      ; a hexadecimal digit
our $HEX = q'[0-9a-f]';

# nonascii                [\200-\377]
our $NON_ASCII = q'[\200-\377]';

# unicode                 \\{h}{1,6}(\r\n|[ \t\r\n\f])?
our $UNICODE = q'(?:(?:\\' . $HEX . q'{1,6})(?:\r\n|[ \t\r\n\f])?)';

# escape                  {unicode}|\\[^\r\n\f0-9a-f]
our $ESCAPE = q'(?:' . $UNICODE . q'|\\[^\r\n\f0-9a-f])';

# nmstart                 [_a-z]|{nonascii}|{escape}
our $NMSTART = q'(?:[_a-z]|' . $NON_ASCII . q'|' . $ESCAPE . q')';

# nmchar                  [_a-z0-9-]|{nonascii}|{escape}
our $NMCHAR = q'(?:[_a-z0-9-]|' . $NON_ASCII . q'|' . $ESCAPE . q')';

# ident                   -?{nmstart}{nmchar}*
our $IDENT = q'-?' . $NMSTART . $NMCHAR . '*';