David Knipe questions

David Knipe answers

• Perl: check if environment variable is set [duplicate]
• Quotes in Node.js spawn arguments
• RegEx help for chess moves (SAN)
• Misunderstanding perl regexp evaluation
• Composite indexing using Redis in a hierarchical data model
• SessionNotFoundException: Session ID is null. Using WebDriver after calling quit()? (Selenium)
• React - Controlling multiple Ajax Calls
• Match consecutive lines in a file.