minor fixes

Author: iliakan

9-regular-expressions/13-regexp-alternation/02-find-matching-bbtags/solution.md

@@ -1,14 +1,14 @@
 
-Opening tag is `pattern:\[(b|url|quote)\]`.
+Opening tag is `pattern:\[(b|url|quote)]`.
 
 Then to find everything till the closing tag -- let's use the pattern `pattern:.*?` with flag `pattern:s` to match any character including the newline and then add a backreference to the closing tag.
 
-The full pattern: `pattern:\[(b|url|quote)\].*?\[/\1\]`.
+The full pattern: `pattern:\[(b|url|quote)\].*?\[/\1]`.
 
 In action:
 
 ```js run
-let regexp = /\[(b|url|quote)\].*?\[\/\1\]/gs;
+let regexp = /\[(b|url|quote)].*?\[\/\1]/gs;
 
 let str = `
   [b]hello![/b]
@@ -20,4 +20,4 @@ let str = `
 alert( str.match(regexp) ); // [b]hello![/b],[quote][url]http://google.com[/url][/quote]
 ```
 
-Please note that besides escaping `pattern:[` and `pattern:]`, we had to escape a slash for the closing tag `pattern:[\/\1]`, because normally the slash closes the pattern.
+Please note that besides escaping `pattern:[`, we had to escape a slash for the closing tag `pattern:[\/\1]`, because normally the slash closes the pattern.