请注意这个模式中各个组的引用方法，即反斜杠加上该组的序号。
Note how you refer to the groups as a backslash followed by the number of the group in the pattern.
创建新的列映射，并使用列序号引用源列和目标列。
Creates a new column mapping, using column ordinals to refer to source and destination columns.
创建新的列映射，并使用列序号引用源列和目标列的列名称。
Creates a new column mapping, using a column name to refer to the source column and a column ordinal for the target column.
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