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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 ### 4.2 Negative Lookahead
Negative lookahead is used when we need to get all matches from input string 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 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 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 regular expression `(T|t)he(?!\sfat)` which means: get all `The` or `the` words