I do not think that a negated character class is a good idea for looking for groups of consonants, because, for example, it will pick groups of digits, as shown below under the Perl debugger: 
  DB<1> $_ ="123 annn jkjkkj bcdefgh 2015 ";

  DB<2> push @words, grep { /[^aeiouy]{4}/i } split;

  DB<3> x \@words;
0  ARRAY(0x600500b18)
   0  'jkjkkj'
   1  2015
  DB<4>

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In reply to Re^2: regular expressions by Laurent_R
in thread regular expressions by mbgbioinfo

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