Cryptic Ruby Global Variables and Their Meanings

The linked page lists and explains global Ruby "dollar" variables, such as:

• $: (load path)
• $* (ARGV)
• $? (Last exit status)
• $$ (PID)
• $~ (MatchData from last successful match)
• ...and many more you'll need when reading weird code.

Regex

• $~ (last MatchData)
• $1 $2 $3 $4 (match groups from the last pattern match)
• $& (last matched string)
• $+ (last match group)
• `$`` (the string before the last match)
• $' (the string after the last match

See this extensive list of variables Show archive.org snapshot .