如何从Jenkins Pipeline中的提交消息中提取字符串

pipeline {
    agent any
    
    stages {
        stage('Extract String') {
            steps {
                script {
                    def commitMessage = sh(returnStdout: true, script: 'git log --format=%B -n 1').trim()
                    def extractedString = commitMessage =~ /提取的字符串：(.+)/
                    
                    if (extractedString) {
                        def extractedValue = extractedString[0][1]
                        echo "提取到的字符串：${extractedValue}"
                    } else {
                        error "未找到要提取的字符串"
                    }
                }
            }
        }
    }
}