Title1
......
Title2: Description
...................
Title3
......
I am trying to match Title1, Description and Title3. Using (?<=: )(.*)(?=\n\.), I can match the Description. I couldn't figure how to match Title1, Description and Title3 together.
In VSCode, you can match the strings by finding the start of the whole file or the colon followed with a whitespace:
(?<=:\s|^(?![^:\n]*:)).*(?=\n\.)
See the demo screenshot:
Details:
(?<= - start of a positive lookbehind (that requires its pattern to match the text immediately to the left of the current location):
:\s - a colon and a whitespace| - or^(?![^:\n]*:) - start of the line that has no : after any zero or more chars other than : and line break chars) - end of the lookbehind.* - the rest of the line(?=\n\.) - a positive lookahead that requires a line break and a . to appear immediately to the right of the current location.See the regex demo.
You might also assert not a : to the left, or assert that that string does not contain : and then match the whole line.
(?<=: |^(?!.*?: )).*(?=\n\.)
The pattern matches:
(?<= Positive lookbehind, assert to the left
: match : | Or^(?!.*?: ) Negative lookahead, start of string and assert not : in the line) Close lookbehind.* Match the whole line(?=\n\.) Assert a newline and .