Source Code : Predefined Character Ranges (Character Classes)

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Predefined Character Ranges (Character Classes)

 
[[:alpha:]] matches any string containing alphabetic characters aA through zZ.
[[:digit:]] matches any string containing numerical digits 0 through 9.
[[:alnum:]] matches any string containing alphanumeric characters aA through zZ and 0 through 9.
[[:space:]] matches any string containing a space.
  
  

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