C＃（.net）RegEx.Match在换行符之间匹配子字符串-使用换行符作为正向超前限制

Question

I have been tinkering with RegEx and got some great results and I want to keep using it.

Right now I am stuck at finding a string that is set between 2 newlines. Here is the sample target text (note this is one of thousands of possible texts):

Substance information in Wikipedia
FORMULA
CH2O
Grafik
Molar mass: 30,03 g/mol

The target is "CH2O".

I tried (?<=FORMULA).*(?=Grafik) with RegexOptions.Singleline and it starts right after FORMULA but goes all the way down and ignores Grafik .

I tried it without singleline but it returns nothing since the . stops at the \\n . Since I want the newline as a limit, the following has no singleline.

The closest I have gotten were these:

(?<=FORMULA)[\w\W]+(?=Grafik)
(?<=FORMULA)[\w\W]*(?=Grafik)

However, if the Grafik changes, I'd like to track the newline instead of it.

(?<=FORMULA)[\\w\\W]*(?=\\n) or (?<=FORMULA)[\\w\\W]*(?=\\r) will still match Grafik for some reason...

Does anyone know a more optimal way to make the positive lookahead the newline?

Please don't answer anything unrelated to RegEx.

Answer 1

Would this work for you

(?<=FORMULA\s+)\S+

Matches everything after FORMULA and before a new line