Add more escape special character examples

Author: gsusanto-fastly

doc/GUIDE.md

@@ -186,14 +186,14 @@ Also, `\z` is more efficient, so it is better to use it in places where `\n` can
 Many characters have special meaning in regex (for example `.`, `+`, `*`, `?`, `[`, `(`).
 If you mean to match them literally, escape them:
 
-```regex
-# Correct: dot is treated literally
-example\.com
-
-# Incorrect: dot matches any character
-example.com.     # also matches "exampleXcom"
-```
-
+| Literal You Want           | Correct Regex               | Explanation                                |
+|----------------------------|-----------------------------|--------------------------------------------|
+| `example.com`              | `example\.com`              | `.` matches any character unless escaped   |
+| `a+b`                      | `a\+b`                      | `+` means “one or more”                    |
+| `price?`                   | `price\?`                   | `?` means “optional”                       |
+| `[value]`                  | `\[value\]`                 | `[` and `]` start/end a character class    |
+| `(test)`                   | `\(test\)`                  | `(` and `)` begin/end a group              |
+| Markdown link `[t](u)`     | `(\[[^]]*\]\([^)]*\))`      | Matches `[text](url)` without crossing `]` or `)` |
 ---
 
 ### 5. Use Non-Capturing Groups