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'
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11 comments:

  1. AnonymousAugust 28, 2012 at 11:36 PM

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

    ReplyDelete
  2. AnonymousJanuary 26, 2013 at 1:07 AM

    Thanks for this, I understand how it works now.

    ReplyDelete
  3. UnknownNovember 7, 2013 at 3:40 AM

    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?

    ReplyDelete
  4. AnonymousMarch 25, 2014 at 4:25 AM

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

    ReplyDelete
  5. AnonymousJune 21, 2014 at 12:34 AM

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

    ReplyDelete
  6. TorgeirJuly 4, 2014 at 6:14 PM

    Succinct, awesome.

    ReplyDelete
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  8. AnonymousJanuary 12, 2016 at 10:24 PM

    :s/\(^\s*\)\@<!\s\+/

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

    ReplyDelete
  9. AnonymousMay 24, 2016 at 8:27 PM

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

    \v(Start)@<!Date

    ReplyDelete
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