A negative look behind : Anchors « Regular Expression « Perl






  1. Perl
  2. Regular Expression
  3. Anchors

A negative look behind

    

while(<DATA>){
    print if /(?<!B) B[a-z]*/;
}
__DATA__
    Betty
    CBC
    ABC








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7.A positive look ahead
8.A positive look behind
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11.Clustering and anchors
12.Beginning and end of word anchors
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15.Shouldn't start a sentence with a period
16.Word-Boundary Pattern Anchors