Regular expression to match a line that doesn't contain a word

Question

Regular expression to match a line that doesn't contain a word

I realize it's feasible to coordinate with a word and afterwards switch the matches utilizing different tools (for example grep - v). In any case, is it possible to coordinate with lines that don't contain a particular word, for example, hede, utilizing a standard expression?
Input:*
*hoho hihi haha hede
*Code:*

grep "<Regex for 'doesn't contain hede'>" input

*Desired output:*

hoho

hihi

haha

regex-negation regex

3 years ago by Amit8z4mc

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**ninja01** · Answer 1 · 2021-05-12T12:30:57

the solution to does not start with “hede”:



^(?!hede).$

is generally much more efficient than the solution to does not contain “hede”:



^((?!hede).)$

The former checks for “hede” only at the input string’s first position, rather than at every position.

**sandhya6gczb** · Answer 2 · 2021-05-13T13:43:21

If you want the regex test to only fail if the entire string matches, the following will work:



^(?!hede$).*

For exact matching use this



myStr !== 'foo'

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Regular expression to match a line that doesn't contain a word

2 Answers

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