Hello,

when I set generic webhook in declarative pipeline like below code,
in regexpFilterExpression, it can't catch the variable "ci_branch " that I configured in enviroment, regexpFilterExpression will get a finally value: refs/heads/null , the expected value should be refs/heads/master
And by the way , if the variable configured in pipeline parameters , regexpFilterExpression can get the correct value. And, if use some jenkins built in variables such as env.JOB_NAME, it also culd get the correct value.

I think this may be a bug in jenkins level that the Jenkins didn't transfer the pipeline environment variables to plugins .  Hope your help, Thanks.

(At first I tried report a bug to generic-webhook-trigger-plugin ,but seems it's not the plugin issue )

......

parameters {
    string(name: "action", defaultValue : "toBuild", description: "something")
}

environment { 
    ci_branch = "master"
}

triggers {
    GenericTrigger(
    genericVariables: [
        [key: 'branch', value: '$.ref', expressionType: "JSONPath"],
        [key: 'repository', value: '$.repository.full_name', expressionType: "JSONPath"]
    ],

    causeString: "Auto deployed ",

    token: 'ServiceTempQA',
    tokenCredentialId: '',

    printContributedVariables: true,
    printPostContent: true,

    silentResponse: false,

    regexpFilterText: '$branch',
    regexpFilterExpression: 'refs/heads/' + env.ci_branch
    )
}

......