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Fixing a typo

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Check if `pattern:Y` is immediately after `pattern:X`  and then the regex will check if Z is immediately after Y,  Like this it's more understandable.
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Sohail Ashraf 2020-01-29 13:38:00 +08:00 • committed by GitHub
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9-regular-expressions/14-regexp-lookahead-lookbehind/article.md
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@ -26,7 +26,7 @@ More complex tests are possible, e.g. `pattern:X(?=Y)(?=Z)` means:
1. Find `pattern:X`.
2. Check if `pattern:Y` is immediately after `pattern:X` (skip if isn't).
3. Check if `pattern:Z` is immediately after `pattern:X` (skip if isn't).
3. Check if `pattern:Z` is immediately after `pattern:Y` (skip if isn't).
4. If both tests passed, then it's the match.
In other words, such pattern means that we're looking for `pattern:X` followed by `pattern:Y` and `pattern:Z` at the same time.