Regex: negative lookbehind

using regex: (?<!map)\s+.collect\(Collectors.toL

To match:

all 2 line strings where the first line does not have "map"
And the second line has collect(Collectors.toL

Use a negative lookbehind, but as you can see in the link below, the second test is also being matched.

How do we update so as to match as specified above?

Solution

You negative lookbehind condition isn't correct because .map can have many characters before matching .collect. Besides a negative lookbehind with dynamic length isn't supported in most of regex flavors.

You may use this regex with a negative lookahead:

^(?!\s*\.map).+\n\s*\.collect\(Collectors\.toL

RegEx Demo

Here:

^: Start
(?!\s*\.map): Fail the match if we have .map after 0 or more whitespaces
.+\n: Match 1+ chars followed by a line break
\s*\.collect\(Collectors\.toL: Match your desired text in a new line

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