regexp: Update formatting

regexp.md

@@ -5,56 +5,61 @@ layout: 2017/sheet
 weight: -1
 authors:
   - github: rizqyhi
-updated: 2018-10-26
+updated: 2019-03-24
 description: |
   Basic cheatsheets for regular expression
 ---
 
-### Character Classes
+##
 
-| Pattern | Description |
-| ---     | --- |
-| `.`     | Any character, except newline |
-| `\w`    | Word |
-| `\d`    | Digit |
-| `\s`    | Whitespace |
-| `\W`    | Not word |
-| `\D`    | Not digit |
-| `\S`    | Not whitespace |
-| `[abc]` | Any of a, b, or c |
+{: .-three-column}
+
+### Character classes
+
+| Pattern | Description                    |
+| ------- | ------------------------------ |
+| `.`     | Any character, except newline  |
+| `\w`    | Word                           |
+| `\d`    | Digit                          |
+| `\s`    | Whitespace                     |
+| `\W`    | Not word                       |
+| `\D`    | Not digit                      |
+| `\S`    | Not whitespace                 |
+| `[abc]` | Any of a, b, or c              |
 | `[a-e]` | Characters between `a` and `e` |
-| `[1-9]` | Digit between `1` and `9` |
+| `[1-9]` | Digit between `1` and `9`      |
 
 ### Anchors
 
-| Pattern | Description |
-| ---     | --- |
-| `^abc` | Start with `abc` |
-| `abc$` | End with `abc` |
+| Pattern | Description      |
+| ------- | ---------------- |
+| `^abc`  | Start with `abc` |
+| `abc$`  | End with `abc`   |
 
-### Escaped Characters
+### Escaped characters
 
-| Pattern | Description |
-| ---        | --- |
+| Pattern    | Description                            |
+| ---------- | -------------------------------------- |
 | `\. \* \\` | Escape special character used by regex |
-| `\t`       | Tab |
-| `\n`       | Newline |
-| `\r`       | Carriage return |
+| `\t`       | Tab                                    |
+| `\n`       | Newline                                |
+| `\r`       | Carriage return                        |
 
 ### Groups
 
-| Pattern | Description |
-| ---     | --- |
+| Pattern | Description   |
+| ------- | ------------- |
 | `(abc)` | Capture group |
 
 ### Quantifiers
 
-| Pattern  | Description |
-| ---      | --- |
-| `a*`     | Match 0 or more |
-| `a+`     | Match 1 or more |
-| `a?`     | Match 0 or 1 |
-| `a{5}`   | Match exactly 5 |
-| `a{,3}`  | Match up to 3 |
-| `a{3,}`  | Match 3 or more |
+| Pattern  | Description           |
+| -------- | --------------------- |
+| `a*`     | Match 0 or more       |
+| `a+`     | Match 1 or more       |
+| `a?`     | Match 0 or 1          |
+| `a{5}`   | Match exactly 5       |
+| `a{,3}`  | Match up to 3         |
+| `a{3,}`  | Match 3 or more       |
 | `a{1,3}` | Match between 1 and 3 |
+