in reply to Testing if a string is a substring
The index functions is also your friend, see the relevant perldoc.
However, for serious work (i.e. long strings) you may want to have a look at the following book:
@BOOK{Gusf97, title = {Algorithms on strings, trees and sequences}, publisher = {Cambridge University Press}, year = {1997}, author = {Dan Gusfield}, address = {Cambridge}, }or the BioPerl project.
Hope this helps, -gjb-
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