我有以下文字
availableMemoryMb: 1024 buildId: b12dfv231-3422-4dsvec-adfdfa-1dvf13vd8 entryPoint: get_request_data httpsTrigger: securityLevel: SECURE_OPTIONAL url: https://us-central1-vvsfdv ds.cloudfunctions.net/evses ingressSettings: ALLOW_ALL labels: deployment-tool: cli-gcloud maxInstances: 1 name: projects/sasvbsd/locations/us-central1/functions/adfva runtime: python37 serviceAccountEmail: <a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="17767574733a73727157766767646778633970647265617e7472767474786279633974787a" rel="noreferrer noopener nofollow">[email protected]</a> sourceUploadUrl: https://storage.googleapis.com/gcf-upload-us-central1-ed32d2-7232322-44h73-96f0-6610891aa7ca/8f5950a6-0efd-4cca-9297-b5104156208b.zip?GoogleAccessId=service-12332@gcf-admin-robot.iam.gserviceaccount.com&Expires=1619892863&Signature=aH1%2BW741GRtVNM1rrwpz8jfxzhNCnQ%2BP5of%2Bq0ghMrcsmR6lM6PgJnHFVTZ5FsWC484rUhFIhBj5IYNEP0Egw4VA0Ui9o3hQSL9NdqBUMtmLM%2BqKKagHVHtUm1Rfr6U4xRxUm4z0SiHNSMB5aZEfwbdmCj6r%2FEx5HuKp5c9HNyJ8LYXynBrjztlZr9GkmHkyHMPM9CjW0c33BMeEWHEGqxUAj%2FyPksPn7y9WPbQFCiwUiQbd3ayuW%2FMVC53IVwjxkojrzLATGVvu12%2Brc9fQs7Zz%2FEc1ZthUVwBAdBYVj8Fn%2Fde5S7OJwdRUm938N%2B5gCX4x%2B7s25Bq6Lgk%2FLWesLw%3D%3D status: ACTIVE timeout: 60s updateTime: '2021-05-01T17:45:13.094Z' versionId: '7'
我需要从中提取最后一个(并非总是)的versionId(在本例中:7)，这是我的正则表达式 sed 's/\(.*\)versionId:\s+\'\([0-9]+\)\'/\2/' 并且不确定为什么它不起作用，它带着我输入的全部内容返回
最佳答案
根据您显示的示例，请尝试在 sed 中执行以下操作。您无需创建 2 个反向引用，只需一个就足以完成此任务。
sed -E 's/.*versionId:[[:spaces:]]+'"'"'([0-9]+)'"'"'/\1/' Input_file
或者(根据上面 hilipati 的评论可以写成):
sed -E "s/.*versionId:[[:space:]]+'([0-9]+)'/\1/" Input_file
说明:在sed中使用-E选项在程序中启用ERE(扩展正则表达式)。然后使用它的 s 选项执行替换，匹配所有内容直到 versionId:spaces ' 并将以下数字保留到第一个捕获组中，在替换时，仅用数字替换整行，这将只给出数字作为输出按要求。
关于regex - 正则表达式不提取组，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/67353066/