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(?xi)
\b
(                                         # Capture 1: entire matched URL
  (?:
      [a-z][\w-]+:                        # URL protocol and colon
      (?:
      /{1,3}                              # 1-3 slashes
      |                                   #   -or-
      [a-z0-9%]                           # Single letter or digit or '%'
                                          # (Trying not to match e.g. ""URI::Escape"")
      )
      |                                   #   -or-
      www\d{0,3}[.]                       # ""www."", ""www1."", ""www2."" … ""www999.""
      |                                   #   or
      [a-z0-9.\-]+[.][a-z]{2,4}/          # looks like domain name followed by a slash
  )
  (?:                                     # One or more:
      [^\s()<>]+                          # Run of non-space, non-()<>
      |                                   #   -or-
      \(([^\s()<>]+|(\([^\s()<>]+\)))*\)  # balanced parens, up to 2 levels
  )+
  (?:                                     # End with:
      \(([^\s()<>]+|(\([^\s()<>]+\)))*\)  # balanced parens, up to 2 levels
      |                                   #   -or-
      [^\s`!()\[\]{};:'"".,<>?«»“”‘’]     # not a space or one of these punct chars
  )
)

Extracts URLs embedded within other text (e.g. a paragraph of English text).

Mike Strobel
11/19/2010 1:51:16 PM

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