Dave Mitchell questions

Dave Mitchell answers

• Why is substr-lvalue faster than four-arg substr?
• Eliminate whitespace around single letters
• What is the difference about subroutine has the * prototype between Perl 5.22 and before?
• Force Perl to stop special processing of command line arguments if -e eval switch is used
• Declaring sets of anonymous arrays in perl
• Why does perl regex with /mg modifier match past end-of-line?