regexp: Update formatting

regexp.md

@@ -5,15 +5,19 @@ layout: 2017/sheet
 weight: -1
 authors:
   - github: rizqyhi
-updated: 2018-10-26
+updated: 2019-03-24
 description: |
   Basic cheatsheets for regular expression
 ---
 
-### Character Classes
+##
+
+{: .-three-column}
+
+### Character classes
 
 | Pattern | Description                    |
-| ---     | --- |
+| ------- | ------------------------------ |
 | `.`     | Any character, except newline  |
 | `\w`    | Word                           |
 | `\d`    | Digit                          |
@@ -28,14 +32,14 @@ description: |
 ### Anchors
 
 | Pattern | Description      |
-| ---     | --- |
+| ------- | ---------------- |
 | `^abc`  | Start with `abc` |
 | `abc$`  | End with `abc`   |
 
-### Escaped Characters
+### Escaped characters
 
 | Pattern    | Description                            |
-| ---        | --- |
+| ---------- | -------------------------------------- |
 | `\. \* \\` | Escape special character used by regex |
 | `\t`       | Tab                                    |
 | `\n`       | Newline                                |
@@ -44,13 +48,13 @@ description: |
 ### Groups
 
 | Pattern | Description   |
-| ---     | --- |
+| ------- | ------------- |
 | `(abc)` | Capture group |
 
 ### Quantifiers
 
 | Pattern  | Description           |
-| ---      | --- |
+| -------- | --------------------- |
 | `a*`     | Match 0 or more       |
 | `a+`     | Match 1 or more       |
 | `a?`     | Match 0 or 1          |
@@ -58,3 +62,4 @@ description: |
 | `a{,3}`  | Match up to 3         |
 | `a{3,}`  | Match 3 or more       |
 | `a{1,3}` | Match between 1 and 3 |
+