... any book or tutorial on regex.

SSSufe:   In the standard Perl distribution, perlre and perlrequick are definitive and quick, respectively, and perlretut is an excellent tutorial. See also the Monastery's Tutorials section Pattern Matching, Regular Expressions, and Parsing.

Give a man a fish:  <%-{-{-{-<

In reply to Re^2: Print the line with the largest number from standard input by AnomalousMonk
in thread Print the line with the largest number from standard input by SSSufe

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