Source Code : Perl-Compatible Regular Expressions (PCRE)

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Perl-Compatible Regular Expressions (PCRE)

 
w represents a "word" character and is equivalent to the expression [A-Za-z0-9].
    
    W represents the opposite of w and is equivalent to [^A-Za-z0-9].
    
    s represents a whitespace character.
    
    S represents a nonwhitespace character.
    
    d represents a digit and is equivalent to [0-9].
    
    D represents a nondigit character and is equivalent to [^0-9].
    
    
 represents a newline character.
    
    
 represents a return character.
    
    	 represents a tab character.
  
  

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