前者期望条件总是成立，而后者期望两个值不匹配。
The former expects the condition to always be true while the latter expects the two values to be mismatched.
v——将匹配意义进行逆反——即选择那些不匹配搜索条件的行。
V — Invert the sense of matching — that is, select lines that don't match the search criteria.
例如，熟悉 IBM WebSphere Application Server 的读者可能想知道，为什么不直接在 SSLPEER 过滤或出口的匹配条件中包括 issuerDN。
Readers familiar, for example, with IBM WebSphere Application Server might have wondered why not simply include the issuerDN in the SSLPEER filter or in the matching criteria of an exit.
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