Regex lookahead example not as stated in Camel 4th

[Gianni Ceccarelli]

I'd say typo in the book. A "look-ahead assertion" looks like C<< (?=
) >> (note C<=> instead of C<:>). C<< (?:  ) >> is just a
non-capturing group.

  $ perl -E 'say for "0123456789" =~ /(?=(\d{3}))/g'
  012
  123
  234
  345
  456
  567
  678
  789

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