emacs lisp有没有办法改善这个正则表达式

Question

我希望这个正则表达式将每个术语放在大括号内。但是，如果没有与逃生参数项串连这个词与下一届

(replace-regexp-in-string "{ " "{" 
(replace-regexp-in-string "}{" "} {" (replace-regexp-in-string  
"\\(.*?_.\\)" "{\\1}" "\Delta y_t u_t"))) 

所需的输出

y_t a_t ==> {y_t} {a_t} 
\Delta y_t a_t ==> {\Delta y_t} {a_t} 

Answer 1

试试这个，你可能需要调整反斜线数量

(replace-regexp-in-string "}{" "} {" (replace-regexp-in-string  
"\(\(?:\\\w+ \)?\w+\)" "{\\1}" "\Delta y_t u_t"))) 

Answer 2

您可以尝试

(replace-regexp-in-string 
    "\\(\\(?:\\\\[^ \t]+[ \t]\\)?[^ \t]+\\)" "{\\1}" "z_t \\Delta y_t x_t") 

使用与上一个答案相同类型的可选捕获组。