Node:Regexp Patterns, Next:Expression Patterns, Previous:Pattern Overview, Up:Pattern Overview
Regular expressions are one of the first kinds of patterns presented
in this book.
This kind of pattern is simply a regexp constant in the pattern part of
a rule. Its meaning is $0 ~ /pattern/.
The pattern matches when the input record matches the regexp.
For example:
/foo|bar|baz/ { buzzwords++ }
END { print buzzwords, "buzzwords seen" }