Read XSLT 2.0 and XPath 2.0 Programmer's Reference, 4th Edition Online
Authors: Michael Kay
An
atom
is either a
normal character
, a
character class
, a
back-reference
, or a regex enclosed in parentheses.
A
normal character
(
Char
) is any character except
.
,
\
,
?
,
*
,
+
,
|
,
∧
,
$