regress/roff/esc/B.out_ascii

   1 ESC-B(1)                    General Commands Manual                   ESC-B(1)
   2
   3 N\bNA\bAM\bME\bE
   4      e\bes\bsc\bc-\b-B\bB - the roff escape B sequence: validate numerical expression
   5
   6 D\bDE\bES\bSC\bCR\bRI\bIP\bPT\bTI\bIO\bON\bN
   7      empty: 0
   8      digit: 1
   9      no number: 0
  10      trailing garbage: 0
  11      trailing operator: 0
  12      infix operator: 1
  13      infix and trailing operator: 0
  14      chain of operations: 1
  15      trailing para: 0
  16      unclosed para: 0
  17      empty pair of parentheses: 0
  18      parentheses containing number: 1
  19      complex expression: 1
  20      other delimiter: 1
  21      no closing delimiter: 0
  22
  23 OpenBSD                          July 6, 2014                          OpenBSD