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The "R" command is a prefix for the "K" and "S" commands (*Note K: K-command) (*Note S: S-command) which selects a regular expression search (*Note R: Regular-expression-search) instead of an ordinary string search. This allows more general pattern matching than simple string matching. The "R" command can be used with the ">" and "<" direction setting commands as well. For example, the equivalent commands ">RS[A-M][o-z]" and "R>S[A-M][o-z]" would search (*Note >: Right-Angle-Command) (*Note <: Left-Angle-Command) forwards for a word with an upper case letter A through M followed by a lower case letter o through z. This would match words like "Austin", "Muddle", and "Nowhere".