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/x modifier for verbose regexes - video
Scalar variables
String operators - video
String operators: concatenation (.), repetition (x)
Filehandle in SCALAR and LIST context - video
Open and read from text files
Exercise: sort SNMP numbers - video
Regex capturing variables $1, $2, $3, $4, $5, $6, ...
Introduction to Regexes in Perl 5
Perl 5 Regex Cheat sheet
More UNIX commands - video
Test for expected warnings
Compare the speed of Perl and Python regexes
Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.
Test diagnostic messages using diag, note, and explain
How to break lines with max width? (wrap)
Sorting mixed strings
String functions: length, lc, uc, index, substr
Levels of security using (R)?ex
Understanding dates using regular expressions