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Gammar edit (#96)

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Added is to section 4.2
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danieloi 2017-09-22 21:24:31 -04:00 committed by Zeeshan Ahmed
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@ -421,7 +421,7 @@ or `the` which are followed by the word `fat`.
### 4.2 Negative Lookahead
Negative lookahead is used when we need to get all matches from input string
that are not followed by a pattern. Negative lookahead defined same as we define
that are not followed by a pattern. Negative lookahead is defined same as we define
positive lookahead but the only difference is instead of equal `=` character we
use negation `!` character i.e. `(?!...)`. Let's take a look at the following
regular expression `(T|t)he(?!\sfat)` which means: get all `The` or `the` words