Spring Cloud Openfeign Regex expression in path pattern is not supported

Describe the bug according to https://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/mvc.html#mvc-ann-requestmapping-uri-templates-regex, Spring MVC supports regex extraction for @PathVariable

@GetMapping("/users/{id:\\d+}")
public User get(@PathVariable String id) {
}

but feign will throw IllegalStateException

Caused by: java.lang.IllegalStateException: Body parameters cannot be used with form parameters.
Warnings:
- 
    at feign.Util.checkState(Util.java:129)
    at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:125)
    at org.springframework.cloud.openfeign.support.SpringMvcContract.parseAndValidateMetadata(SpringMvcContract.java:194)
    at feign.Contract$BaseContract.parseAndValidateMetadata(Contract.java:62)
    at feign.ReflectiveFeign$ParseHandlersByName.apply(ReflectiveFeign.java:151)
    at feign.ReflectiveFeign.newInstance(ReflectiveFeign.java:49)
    at feign.Feign$Builder.target(Feign.java:269)
    at org.springframework.cloud.openfeign.DefaultTargeter.target(DefaultTargeter.java:30)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.getTarget(FeignClientFactoryBean.java:419)
    at org.springframework.cloud.openfeign.FeignClientFactoryBean.getObject(FeignClientFactoryBean.java:371)
    at org.springframework.cloud.openfeign.FeignClientsRegistrar.lambda$registerFeignClient$0(FeignClientsRegistrar.java:235)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.obtainFromSupplier(AbstractAutowireCapableBeanFactory.java:1231)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1173)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:564)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524)
    ... 82 more