If there are fewer matches found than required, nothing is done to the source.
如果找到的匹配项比要求的少，则不对源进行任何操作。
The tool also has a nice feature to exclude rather than include all matches found.
该工具还有一个优秀的功能，可以排除而不是包括所有匹配的搜索结果。
Returns the total number of matches found.
返回找到的匹配的总数量。
Returns the total number of matches found.
返回找到的匹配的总数量。
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