Match two strings in one line with grep

I think this is what you were looking for:

grep -E "string1|string2" filename

I think that answers like this:

grep 'string1.*string2\|string2.*string1' filename

only match the case where both are present, not one or the other or both.

You can use

grep 'string1' filename | grep 'string2'

grep 'string1.*string2\|string2.*string1' filename

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