File: gawk.info,  Node: Regexp Patterns,  Next: Expression Patterns,  Up: Pattern Overview

7.1.1 Regular Expressions as Patterns
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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" }