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manoj_speed has asked for the wisdom of the Perl Monks concerning the following question:

Hi friend

I used a perl program to substitute values. I used two methods for substitution (as tr/a//d and s/a//g ). Which one will be the faster?

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Re: Substitute values
by vinoth.ree (Monsignor) on Mar 13, 2009 at 13:00 UTC

    tr/// only replaces characters for characters. It is very limited but faster than s/// for simple character replacing. s/// is a full blown regexp that can use all of perls various options for pattern matching and substitution. For example if all you wanted to do was replace all A's with Z's tr is the better choice: tr/A/Z/; tr/// can't even use case insensitive matching so to replace all 'A' and 'a' with 'Z' you have to do this: tr/aA/Z/; the only useful option with tr/// is the range operator: tr/a-z/A-Z/

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