search - Emacs:如何删除以特定文本开头的行

Question

如何查找和删除以文本 in 开头的行?

我使用命令 C-M-s ^in查找以 in 开头的所有行，但后来我真的不知道该怎么办。

Answer 1

M-x flush-lines RET ^in RET
C-h f flush-lines告诉你:

flush-lines is an interactive compiled Lisp function in replace.el.

It is bound to menu-bar edit flush-lines.

(flush-lines REGEXP &optional RSTART REND INTERACTIVE)

Delete lines containing matches for REGEXP.

When called from Lisp (and usually when called interactively as well, see below), applies to the part of the buffer after point. The line point is in is deleted if and only if it contains a match for regexp starting after point.

If REGEXP contains upper case characters (excluding those preceded by \) and search-upper-case is non-nil, the matching is case-sensitive.

Second and third arg RSTART and REND specify the region to operate on. Lines partially contained in this region are deleted if and only if they contain a match entirely contained in it.

Interactively, in Transient Mark mode when the mark is active, operate on the contents of the region. Otherwise, operate from point to the end of (the accessible portion of) the buffer. When calling this function from Lisp, you can pretend that it was called interactively by passing a non-nil INTERACTIVE argument.

If a match is split across lines, all the lines it lies in are deleted. They are deleted before looking for the next match. Hence, a match starting on the same line at which another match ended is ignored.