/^((?!REGULAR_EXPRESSION_HERE).)*$/
For example, if you want to find every lines where the first character is NOT 2 to 4 "f" followed by "oo" and then "bar" somewhere else on the line, you can use:
/^((?!^f{2,4}oo.*bar).)*$/
Example:
"foo+bar"[/^((?!^f{2,4}oo.*bar).)*$/] => "foo+bar"
"fffoo+bar"[/^((?!^f{2,4}oo.*bar).)*$/] => nil
" fffoo+bar"[/^((?!^f{2,4}oo.*bar).)*$/] => " fffoo+bar"
"fffffoo+bar"[/^((?!^f{2,4}oo.*bar).)*$/] => "fffffoo+bar"
For the references, those ideas came from the Vim tips section here.
I hope this will help someone.
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4 comments:
Mmmmm, I'm sure this will turn out useful someday... :) Thanks.
P.S.: Since ruby let you interpolate expressions inside regexps, you could do it like this:
class Regexp
def negated
/^((?!#{ self }).)*$/
end
end
"1 2 3" =~ /2/ # => 2
"1 2 3" =~ /2/.negated # => nil
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Regular expression is really wonderful to parsing HTML or matching pattern. I use this a lot when i code. Actually when I learn any new langauge, first of all I first try whether it supports regex or not. I feel ezee when I found that.
http://icfun.blogspot.com/2008/04/ruby-regular-expression-handling.html
Here is about ruby regex. This was posted by me when I first learn ruby regex. So it will be helpfull for New coders.
You can also do this (in python) by 'splitting' the string based on the regular expression. I'm sure ruby has a similar 'regex split'.
invert a regular expression
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