java - 正则表达式错误，请改用非捕获组

Question

这个问题已经有答案了:

Can't map regular expression - java.lang.IllegalArgumentException: The number of capturing groups in the pattern segment (1 个回答)

已关闭 5 年前。

我有一个 spring 请求映射方法，其中我为路径变量定义了正则表达式，但是当我测试此方法时 Spring 抛出异常，我应该更改什么？

@GetMapping("/items/item/{name:[a-zA-Z]+(\\s[a-zA-Z]+)*}")
public Item getItemByName(@PathVariable String name) {
    return itemService.getItemByName(name);
}

错误:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.IllegalArgumentException: The number of capturing groups in the pattern segment ([a-zA-Z]+(\s[a-zA-Z]+)*) does not match the number of URI template variables it defines, which can occur if capturing groups are used in a URI template regex. Use non-capturing groups instead.

Answer 1

从堆栈跟踪看来，您应该使用非捕获组。

使用[a-zA-Z]+(?:\\s[a-zA-Z]+)*相反 [a-zA-Z]+(\\s[a-zA-Z]+)*

If you do not need the group to capture its match, you can optimize this regular expression into Set(?:Value)?.

更多详细信息here