笔记 Regex Cheat Sheet Syntax Description * 0 or more times + 1 or more times ? 1 or 0 times {m} exactly m times {m,} m or more times {m,n} m to n times (both inclusive) \n new line […] range or character class (e.g. [a-z0-9] all lowercases and digits) [^…] not in range
Tech Installing PostgreSQL on VPS (Ubuntu 20.04 LTS) Notes for how to install a specific version of PostgreSQL. Installation ref: https://www.postgresql.org/download/linux/ubuntu/ * To use the PostgreSQL Apt Repository # Create the file repository configuration: sudo sh -c 'echo "deb http://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main"