positive-lookahead

来源： https://stackoverflow.com/questions/64572162/java-regex-positive-look-ahead-but-match-unique-characters-only

问题 I am trying to capture KEYWORD1 in .NET regex engine based on whether KeyWord2 is present in the string. So far the positive look-around solution I am using: (?=.*KeyWord2)**KEYWORD1** (\m\i) RegEx Test Link only captures KEYWORD1 if KeyWord2 is positioned anywhere behind KEYWORD1 in the string. How can I optimize this in regex so that it captures all instances of KEYWORD1 in the string despite the position of KeyWord2 being ahead, behind or both? I'd really appreciate some insight. Thank You

问题 I'm trying to use a lookbehind and a lookahead in a Grok custom pattern and getting pattern match errors in the Grok debugger that I cannot resolve. This is for archiving system logs. I am currently trying to parse the postgrey application. Given data such as: 2019-04-09T11:41:31-05:00 67.157.192.7 postgrey: action=pass, reason=triplet found, delay=388, client_name=unknown, client_address=103.255.78.9, sender=members@domain.com, recipient=person@domain.com I'm trying to use the following to