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Some metacharacters are valid for one program but not for another. Those that are available are marked by a bullet (·) in Table 7-1. (This table is correct for most commercial Unix systems, including Solaris.) Items marked with a "P" are specified by POSIX; double-check your system's version. (On Solaris, the versions in /usr/xpg4/bin and /usr/xpg6/bin accept these items.) 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 in Table 7-1 are meaningful only in a search pattern. In ed, ex, vi , and sed, the metacharacters in Table 7-2 are valid only in a replacement pattern.
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