它是 \\\` 用于开始缓冲区或字符串。而 \\'为结束。请参阅手册

It's \\` for beginning of buffer or string. And \\' for end. See manual

但是，我认为你的耻辱的根源不是锚点。 char类根据当前语法表匹配不同的字符， [：space：] 要可靠地匹配非打印或打印字符，请使用 [：graph：] 。请参阅 char class

However, I think the root of your confustion isn't the anchor. The [:space:] char class matches different characters based on the current syntax table. To reliably match a non-printing or printing character use [:graph:]. See char class

另外。不会匹配换行符。

例如$（$）

E.g.

(let ((str " \n a\nbc \n "))
  (string-match "\\`[^[:graph:]]*\\(\\(?:.\\|\n\\)+?\\)[^[:graph:]]*\\'" str)
  (match-string 1 str))