-
+
Functions and Operators
expression), an empty set of () (matching the
null string), a bracket expression (see
below), . (matching any single character),
- ^ (matching the null string at the beginning of
- a line), $ (matching the null string at the end
- of a line), a \ followed by one of the
+ ^ (matching the null string at the beginning of the
+ input string), $ (matching the null string at the end
+ of the input string), a \ followed by one of the
characters ^.[$()|*+?{\ (matching that
character taken as an ordinary character), a \
followed by any other character (matching that character taken as