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Here is a summary of the types of patterns supported in awk.
/regular expression/
-
A regular expression as a pattern. It matches when the text of the
input record fits the regular expression.
(See section Regular Expressions.)
expression
-
A single expression. It matches when its value
is non-zero (if a number) or non-null (if a string).
(See section Expressions as Patterns.)
pat1, pat2
-
A pair of patterns separated by a comma, specifying a range of records.
The range includes both the initial record that matches pat1, and
the final record that matches pat2.
(See section Specifying Record Ranges with Patterns.)
BEGIN
-
END
-
Special patterns for you to supply start-up or clean-up actions for your
awk program.
(See section The BEGIN and END Special Patterns.)
empty
-
The empty pattern matches every input record.
(See section The Empty Pattern.)
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