regular expressions

• a vast superset beyond standard Unix regexps

• a ? modifier to make patterns non-greedy

• zero-width lookahead and lookbehind assertions

• conditional expressions

• extra character class matches:

  • \w - match a "word" character (alphanumeric, "_")
  • \W - match a non-word character
  • \s - match a whitespace character
  • \S - match a non-whitespace character
  • \d - match a digit
  • \D - match a non-digit

• http://www.perl.com/pub/doc/manual/html/pod/perlre.html

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