Match string that doesn't contain a specific word

Question

I'm working with ruby with the

match

method and I want to match an URL that doesn't contain a certain string with a regular Expression:
ex:

http://website1.com/url_with_some_words.html

http://website2.com/url_with_some_other_words.html

http://website3.com/url_with_the_word_dog.html

I want to match the URLs that doesn't contain the word

dog

, so the 1st and the 2nd ones should be matched

Answer 1

Just use a negative lookahead ^(?!.*dog).*$.

Explanation

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