According to the grep man page: Grep understands two different versions of regular expression syntax: “basic” and “extended.” In GNU grep, there is no difference in avail- able functionality using either syntax.
However, the following function differently: grep -G 'cat|dog|bird' filename (Basic) grep -E 'cat|dog|bird' filename (Extended)
Am I interpreting something incorrectly?
The command : grep -E 'cat|dog|bird' filename will output any line that contains cat OR dog OR bird or any combination.
Does anyone know how to construct a regular expression or in any way get a single grep execution to do an AND instead of an OR operation so that it looks for more that one string and matches a line when ALL the items exist on that line, and are possibly in RANDOM order?
i.e. Find these lines cat dog bird bird dog cat dog cat bird etc.
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