B Chen questions

• confusion about basic rules of regex in Perl
• show source code for a function in a package in R [duplicate]
• Concatenation needs a "space" in Perl?
• workflow between Latex and R screwed
• how to form a new array based on part of an existing array
• To see All the content (not just objects) in a package in R
• rules (?) of parens/brackets usage in perl
• Why do Perl's logical operators &&, ||, ! take precedence over and, or, and not?

B Chen answers