CODEWITHSUNDEEP
regexperl
Jasmine Lognnes
Jasmine Lognnes

Reputation: 7087

How to remove matching lines excluding certain others?

If I have the following in a variable

\item () $0.25$
  \item () $0.7$
\item 
  \item

how do I then remove the lines that matche \item but not those that have a set of ()?

If I do

$f =~ s|\\item.*?(?!\()||g;

then it deletes all \item for some reason.

Upvotes: 3

Views: 78

Answers (1)

ikegami
ikegami

Reputation: 385590

You are searching if there's a position after \item that's not followed by (. There is in all cases.

\item () $0.25$
     ^ ^^^^^^^^^  These positions aren't followed by "("

The .*? should be in the (?!).

s{ ^ .*? \\item (?! [^(\n]* \( ) .* \n }{}mgx

Upvotes: 6

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