Clustering or grouping : Group « Regular Expression « Perl

1. Perl
2. Regular Expression
3. Group

Clustering or grouping

   

while(<DATA>){
    print if /\s(12){3}$/;  # match exactly 3 consecutive occurrences of 12 at the end of the line
}
__DATA__
    Mary
    Betty Boop
    Mark 123
    123 123 123

   
    
    
  

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