正则表达式：标记模式

Question

我试图标记一个包含“manu”的句子，从它最近的\n\n到它最近的\n\n， 这是文本

\n\nHolds Certificate No: EMS 96453\nand operates an Environmental Management System which complies with the requirements of ISO for\n\nthe following scope:The Environmental Management System of Dow Corning, for management of environmental\nrisks associated with all global business processes for the marketing, developing,\n   manufacturing, and supply of silicon-based and complementary products and services.\n\n/ tou\n\nFor and on behalf\n\n

我只想记下这个

the following scope:The Environmental Management System of Dow Corning, for management of environmental\nrisks associated with all global business processes for the marketing, developing,\n   manufacturing, and supply of silicon-based and complementary products and services.

我试过这个正则表达式

\\n\\n(.+manu.+?)\\n\\n

但是它忽略了与我的模式最近的\n\n，并且标记了比我想要的多得多的文本

Holds Certificate No: EMS 96453\nand operates an Environmental Management System which complies with the requirements of ISO for\n\nthe following scope:The Environmental Management System of Dow Corning, for management of environmental\nrisks associated with all global business processes for the marketing, developing,\n   manufacturing, and supply of silicon-based and complementary products and services.

我错过了什么

Answer 1

模式从左侧开始，首先匹配\\n\\n，然后使用匹配任何字符的点。因此，在这种情况下，它将匹配manu，而不考虑中间的任何字符

您可以使用模式来匹配\\n\\n，并确保在遇到manu之前不再匹配它

然后进行匹配，直到它后面第一次出现\\n\\n，然后在捕获组中捕获所需的部分

\\n\\n((?:(?!\\n\\n).)+manu.+?)\\n\\n

解释

• \\n\\n逐字匹配
• (捕获组1
  • (?:(?!\\n\\n).)+匹配任何断言右侧内容的字符都不是\\n\\n
  • manu.+?匹配manu后跟尽可能少的字符
• )关闭组1
• \\n\\n逐字匹配

Regex demo

如果还希望在后面跟\\n\\n或字符串结尾时匹配：

\\n\\n((?:(?!\\n\\n).)+manu.+?)(?:\n\\n|$)

Regex demo