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.Dd July 6, 2014
.Dt ESC-B 1
.Os OpenBSD
.Sh NAME
.Nm esc-B
.Nd the roff escape B sequence: validate numerical expression
.Sh DESCRIPTION
empty: \B''
.br
digit: \B'0'
.br
no number: \B'no number'
.br
trailing garbage: \B'1X'
.br
trailing operator: \B'1+'
.br
infix operator: \B'1+1'
.br
infix and trailing operator: \B'1+1+'
.br
chain of operations: \B'1+2+3+4'
.br
trailing para: \B'1+('
.br
unclosed para: \B'(1'
.br
empty pair of parentheses: \B'()'
.br
parentheses containing number: \B'(42)'
.br
complex expression: \B'3+(3*(5==5*2)*4)+(3*5)/2'
.br
other delimiter: \Bx1+1x
.br
no closing delimiter: \B'1+1
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