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• /x modifier for verbose regexes - video

• Scalar variables

• String operators - video

• String operators: concatenation (.), repetition (x)

• How to extract strings from a file

• Logical or and Exclusive Or

• Sorted hash in Perl using Tie::IxHash

• $^X

• Open and read from text files

• Use of uninitialized value $got in pattern match (m//) at Test/Deep/Regexp.pm line 57.

• Multiple expected values - testing dice

• Benchmark: Refactoring MD5 calculation in Rex

• min, max, sum in Perl using List::Util

• Short-circuit in boolean expressions

• Sorting mixed strings

• The easiest way to find the highest hash value without looping through all of them (max)

• Index/Value Array Slices

• Multiple command line counters with plain TSV text file back-end

• Serving static files such as favicon.ico and robots.txt using Plack

• Always check if the regex was successful