关于触发器功能使用的几个问题

请教几个触发器使用的问题
1. 在触发器中怎样发送回车？
2. 在触发器中怎样匹配某个字符串并获取字符串前的一部分字符，然后再发送文本中发送

The issue asks how triggers can send a carriage return and match a string to capture preceding characters before sending text. No source file, test, or entry point is identified; first locate the trigger usage documentation or implementation, then document answers that can be verified against the actual trigger behavior.

Written by the indexing model from the issue text.