从字符串修剪花括号 [英] Trim curly braces from string

问题描述

我在Common Lisp程序中使用Prolog查询来从知识库中获取出生日期.该查询返回格式为{1991-05-13}的值，我使用setq:(setq dob {1991-05-13})将其分配给dob变量.我想在使用字符串的新函数中使用此日期值，因此我尝试使用write-to-string将dob转换为带有(setq strdob (write-to-string dob))的字符串，但它返回

I am using a Prolog query in a Common Lisp program to get the date of birth from a knowledge base. The query returns the value formatted as {1991-05-13}, and I assign to this value on dob variable with setq: (setq dob {1991-05-13}). I want to use this date value in a new function which takes string, so I am trying to use write-to-string to convert dob to a string with (setq strdob (write-to-string dob)), but it returns

"{1991-05-13}"

我实际上想要:

"1991-05-13"

缺少花括号.如何修剪字符串中的花括号?

which lacks the curly braces. How could I trim the curly braces from the string?

推荐答案

CL-USER 13 > (string-trim '(#\{ #\}) "{1991-05-13}")
"1991-05-13"

CL-USER 14 > (string-trim "{}" "{1991-05-13}")
"1991-05-13"

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