Intel XENIX 286 Programmers Guide (86) - Tenox.tc

lex: Lexical Analyzer Generator
Regular expressions in lex use the following operators:
x The character x
"x" An x, even if x is an operator
\x An x, even if x is an operator
[xy] The character x or y
[x-z] The characters x, y, or z
["x] Any character but x
"x
X
x$
x?
x*
x+
xly
(x}
x/y
{xx}
x{m,n}
9-24
Any character but newline
An x at the beginning of a line
An x when lex is in start condition y
An x at the end of a line
An optional x
0,1,2, ••• instances of x
1,2,3, .•. instances of x
An x or a y
An x
An x but only if followed by y
The translation of xx from the definitions section
m through n occurrences of x
XENIX Programming