7.3. Metacharacters, Listed by ProgramSome metacharacters are valid for one program but not for another. Those that are available are marked by a bullet (•) in the following table. Items marked with a "P" are specified by POSIX. Full descriptions were provided in the previous section.
Note that in ed, ex, vi, and sed, you specify both a search pattern (on the left) and a replacement pattern (on the right). The metacharacters listed above are meaningful only in a search pattern. In ed, ex, vi, and sed, the metacharacters in the following table are valid only in a replacement pattern.
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