fixes #1836

Author: iliakan

9-regular-expressions/14-regexp-lookahead-lookbehind/article.md

@@ -26,10 +26,10 @@ 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:Y` (skip if isn't).
-4. If both tests passed, then it's the match.
+3. Check if `pattern:Z` is also immediately after `pattern:X` (skip if isn't).
+4. If both tests passed, then the `pattern:X` is a match, otherwise continue searching.
 
-In other words, such pattern means that we're looking for `pattern:X` followed by   `pattern:Y` and `pattern:Z` at the same time.
+In other words, such pattern means that we're looking for `pattern:X` followed by `pattern:Y` and `pattern:Z` at the same time.
 
 That's only possible if patterns `pattern:Y` and `pattern:Z` aren't mutually exclusive.