(gawk.info)Regexp Patterns

Regular Expressions as Patterns
-------------------------------

   We have been using regular expressions as patterns since our early
examples.  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" }