🔰special characters

🚧 under construction

JS ⟩ value ⟩ object ⟩ regex ⟩ pattern ⟩ special characters

// need to be escaped with a backslash (\)
. ? + * ^ $ \ /
( ) [ ] { } |	
// any other character matches itself.

🔴 主題

• . - any character 👉 character set.

• ? - repeat 0 ~ 1, or lazy.

• + - repeat 1 ~ ∞.

• * - repeat 0 ~ ∞.

• ^ - beginning anchor, or invert a set 👉 character set.

• $ - end anchor.

• \ - escape.

• / - delimiter for regex in JS, for example: /abc/.

• () - group.

• [] - ranges, alternation, 👉 character set.

• {} - times to repeat.

• | - alternation (or).

⭐️ 重點

[.+]	// ".", "+" have NO special meaning in brackets

💈範例

// code

📗 參考

• Regular Expression Quick Reference

• Eloquent JavaScript ⟩ Regular Expressions ⟩ Sets of Characters

📘 手冊

• JavaScript Guide ⟩ Regular expressions ⟩

  • escaping

  • Unicode property escapes