(POSIX ), Shells and Utilities, Section 4, Utilities,
                    grep (FWD.1).
                  </p>
                  <p>
                    That is to say, the same as <a class="link" href="../../syntax/basic_extended.html" title="POSIX Extended Regular Expression Syntax">POSIX
                    extended syntax</a>, but with the newline character acting
                    as an alternation character in addition to "|".
                  </p>
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