Patterns

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Patterns
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   Patterns in `awk' control the execution of rules: a rule is executed
when its pattern matches the current input record.  This chapter tells
all about how to write patterns.

Kinds of Patterns: A list of all kinds of patterns. The following subsections describe them in detail.
Regexp: Regular expressions such as `/foo/'.
Comparison Patterns: Comparison expressions such as `$1 > 10'.
Boolean Patterns: Combining comparison expressions.
Expression Patterns: Any expression can be used as a pattern.
Ranges: Pairs of patterns specify record ranges.
BEGIN/END: Specifying initialization and cleanup rules.
Empty: The empty pattern, which matches every record.

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