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regexspring-cloud

My regex does not effective in spring-cloud-gateway

I'm learning spring-cloud-gateway, when I practice predicates, I want to try some regex like followings:

spring:
  cloud:
    gateway:
      routes:
        - id: after_route
          uri: http://www.google.com/
          predicates:
            - Cookie=token, hello*

I think hello* will matches hello,helloa,helloaaaaa..., but when I test by curl --cookies ..., it only matches hello, why helloa and helloaaaaa does not matches correctly?

Does regex in spring cloud application.yml need some changes?

Solution

  • I doesn't have anything to do with yaml or gateway just java regex

    "helloaaaa".matches("hello*") // returns false.

    But this works

    "helloaaaa".matches("hello.*") // returns true.

    Patter javadoc says X* matches X, zero or more times

    So your regex would match "hellooooo"

    "hellooooo".matches("hello*") // returns true.