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gawk: Regexp Patterns

 7.1.1 Regular Expressions as Patterns
 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" }
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