## 2009-07-28

### Negative Lookbehind in vim

very similar to the last post, but this time for _not_ matching text that is preceded with some other text, and this time using the vim regex engine which is syntactically a little different
/$$Start$$\@<!Date
This will match the 'Date' in 'EndDate' and 'YesterdaysDate' but will not match 'StartDate'

and what the hell, while I'm lookup up vim syntax, here's negative lookahead:
/Start$$Date$$\@!
will match the 'Start' in 'Starting but not in 'StartDate'

Positive lookahead:
/Start$$Date$$\@=
will match the 'Start' in 'StartDate' but not in 'Starting

Positive lookbehind
/$$Start$$\@<=Date
will match the 'Date' in 'StartDate' but not in 'EndDate' and 'YesterdaysDate'

#### 12 Comments:

Anonymous said...

Thanks. I was having trouble a while ago with trying to do lookahead/lookbehind in vim and this was helpful

August 28, 2012 at 11:36 PM
Anonymous said...

Thanks for this, I understand how it works now.

January 26, 2013 at 1:07 AM
Unknown said...

This is great, I love the title of your Blog! One question, do you know if there's an easy way to use perl compatible regular expressions?

November 7, 2013 at 3:40 AM
Anonymous said...

Thank you for this post, it helped me understand negative lookbehind :)

March 25, 2014 at 4:25 AM
Anonymous said...

Excellent post, I like that it is simple and features examples, exactly what I needed

June 21, 2014 at 12:34 AM
Torgeir said...

Succinct, awesome.

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Anonymous said...

:s/$$^\s*$$\@<!\s\+/

Remove extraneous spaces, but not at the start of the line

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April 26, 2016 at 12:23 PM
Anonymous said...

Don't forget "very magic" mode \so \you \don't \have \to \escape \everything:

\v(Start)@<!Date

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