正则表达式错误，改用非捕获组

Question

我有一个 spring 请求映射方法，我在其中为路径变量定义了正则表达式，但是 Spring 在测试此方法时抛出异常，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

从堆栈跟踪来看，您似乎应该使用非捕获组。

使用[a-zA-Z]+(?:\s[a-zA-Z]+)*代替[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)?.

更多详情here

正则表达式错误，改用非捕获组

Regex error, use non-capturing groups instead

java

regex

spring

spring-mvc

spring-restcontroller