Moves the edit point the specified number of characters to the left.
将编辑点向左移动指定的字元数目。
If the text is found, the edit point is moved to the beginning of the match.
如果找到了文本，编辑点就移到匹配的开始处。
If the pattern is found, the edit point is moved to the beginning of the match.
如果找到了模式，编辑点就移动到匹配项的开始处。
If the pattern is found, the edit point is moved to the beginning of the match.
如果找到了模式，编辑点就移动到匹配项的开始处。
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