perldoc.perl.org/perlretut.html might be a good place to start.
or
this uk university site
or
the Enginsite site
Better yet, perhaps, browse all of those, playing with regexen in their examples and puzzles; then -- when you start to get comfortable -- get Friedl. As prior respondent said, it's very worthwhile to have -- on a (handy, nearby) shelf -- but (IMO, ymmv) is not really a great place to start, in part because of its unusual markup, which adds a learning curve to the Regex learning curve.
That said, you could do far worse than buying a copy now, and see if it works for you as a tutorial.
Updated: For clarity, changed word order in 2nd sentence of first narrative graf.
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