Digression for a Practical Application

• Let's apply what we know

• Someone showed up on IRC asking this today:

• ``How do I remove the characters from the last x to the end?''

        s/x.*//;                # WRONG

        s/(.*)x.*/$1/;          # Right, but slow

        s/x[^x]*//;             # WRONG

        s/x[^x]*$//;            # Ahhhh.  (1/3 faster)

• End of digression

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Copyright © 2002 M. J. Dominus