You saw in Part 1, Figure 13 that the cn attribute type has a field called substr, which defines the matching rules for substring match.
在第1部分的图13可以看到，cn属性类型有一个叫做SUBSTR的字段，它定义了子字符串匹配的匹配规则。
Returns the position of the first substring match in a regular expression search.
返回正则表达式搜索中第一个子字符串匹配项的位置。
Returns the position of the first substring match in a regular expression search.
返回正则表达式搜索中第一个子字符串匹配项的位置。
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