Yes. The terse explanation can be perused at perlop, but here is simple explanation in the meantime:

tr/// is the transliteration operator. It is used to convert all occurances of one character class to another: 

tr/0-9/A-J/

[download]
s/// is the substitution operator. It replaces a pattern with some replacement string: 
s/foo/bar/

[download]
The differences in the results can be subtle. A great explanation of when to use to which (don't rule out substr as a solution either) can be found at Code Smarter.

Jeff 

R-R-R--R-R-R--R-R-R--R-R-R--R-R-R--
L-L--L-L--L-L--L-L--L-L--L-L--L-L--

In reply to (jeffa) Re: Question about use of tr/ / / and s/ / /g by jeffa
in thread Question about use of tr/ / / and s/ / /g by Jemts

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