🚩regex flag

🚧 under construction

JS ⟩ value ⟩ object ⟩ regex ⟩ flag

/abc/igd	     // ignnore case, global search, generate indices

flag	description	corresponding property
d	generate indices for substring matches.	hasIndices
u	treat a pattern as a sequence of Unicode code points.	unicode
g	global search.	global
i	ignore case.	ignoreCase
m	allows ^ and $ to match newline.	multiline
s	allows . to match newline.	dotAll
y	"sticky" search: matches starting at the current position in the target string.	sticky

🧨 雷區

when using str.matchAll(regex), the regex must have the global (g) flag set, or a TypeError is thrown❗

💈範例

• 💈範例：

  • quick brown fox - example for d, g, i flags.

// code

📗 參考

• Eloquent JS ⟩ Regular Expressions ⟩

  • Sets of Characters

  • lastIndex

📘 手冊

• JavaScript Guide ⟩ Regular expressions ⟩ Advanced searching with flags