The ^ and $ Pattern Anchors : Anchors « Regular Expression « Perl

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Perl » Regular Expression » Anchors 




The ^ and $ Pattern Anchors
    

^ and $ matches only at the beginning or the end of a string. 

/^def/ matches def only if these are the first three characters in the string. 
/def$/ matches def only if these are the last three characters in the string. 

combine ^ and $ to force matching of the entire string. 
/^def$/ matches only if the string is def. 

   
    
    
    
  














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6.A negative look behind
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