javascript-tutorial · odsantos · Mar 12, 2023 · Mar 12, 2023
diff --git a/...ular-expressions/14-regexp-lookahead-lookbehind/2-insert-after-head/solution.md b/...ular-expressions/14-regexp-lookahead-lookbehind/2-insert-after-head/solution.md
@@ -1,6 +1,6 @@
 In order to insert after the `<body>` tag, we must first find it. We can use the regular expression pattern `pattern:<body.*?>` for that.
 
-In this task we don't need to modify the `<body>` tag. We only need to add the text after it.
+In this task, we don't need to modify the `<body>` tag. We only need to add the text after it.
 
 Here's how we can do it:
 
@@ -26,11 +26,11 @@ As you can see, there's only lookbehind part in this regexp.
 
 It works like this:
 - At every position in the text.
-- Check if it's preceeded by `pattern:<body.*?>`.
-- If it's so then we have the match.
+- Check if it's preceded by `pattern:<body.*?>`.
+- If it's so, then we have the match.
 
-The tag `pattern:<body.*?>` won't be returned. The result of this regexp is literally an empty string, but it matches only at positions preceeded by `pattern:<body.*?>`.
+The tag `pattern:<body.*?>` won't be returned. The result of this regexp is literally an empty string, but it matches only at positions preceded by `pattern:<body.*?>`.
 
-So it replaces the "empty line", preceeded by `pattern:<body.*?>`, with `<h1>Hello</h1>`. That's the insertion after `<body>`.
+So it replaces the "empty line", preceded by `pattern:<body.*?>`, with `<h1>Hello</h1>`. That's the insertion after `<body>`.
 
 P.S. Regexp flags, such as `pattern:s` and `pattern:i` can also be useful: `pattern:/<body.*?>/si`. The `pattern:s` flag makes the dot `pattern:.` match a newline character, and `pattern:i` flag makes `pattern:<body>` also match `match:<BODY>` case-insensitively.
diff --git a/9-regular-expressions/14-regexp-lookahead-lookbehind/2-insert-after-head/task.md b/9-regular-expressions/14-regexp-lookahead-lookbehind/2-insert-after-head/task.md
@@ -21,6 +21,7 @@ str = str.replace(regexp, `<h1>Hello</h1>`);
 ```
 
 After that the value of `str` should be:
+
 ```html
 <html>
   <body style="height: 200px"><h1>Hello</h1>
-Original file line number
+Diff line change
@@ Expand Up / @@ -21,6 +21,7 @@ str = str.replace(regexp, `<h1>Hello</h1>`); @@
     ```
     After that the value of `str` should be:
     ```html
     <html>
       <body style="height: 200px"><h1>Hello</h1>
@@ Expand Down @@