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'<a href="..." target="...">' =~ /
   <a            # Matches '<a'.
...
   .+?           # Matches 'href="..." target="..."'.
   >             # Matches '>'.
/isx;

'<a target="..." href="...">' =~ /
   <a            # Matches '<a'.
...
   .+?           # Matches 'arget="..." href="..."'.
   >             # Matches '>'.
/isx;

/(?:(?!$re).)*/