It seems there are 7 JS RegExp modifiers:

• d indices
• g global
• i case
• m multiline
• s dotall
• u unicode
• y sticky

Which of the above are applicable for doing regex.test(string) ? For example, since it just tests whether the string contains one or more matches or not, isn't the g flag N/A for it? In other words:

/h/.test("h h h h") === /h/g.test("h h h h")

i, m, s, and u seem like they would be applicable, but I'm also not certain about d (I think not since it relates to indices and this just returns a bool?) or y (I think yes). Which modifiers make sense for the .test() method?

CodePudding user response：

If you look at the spec, you can see that it simply calls RegExp.exec and then coerces a null result to false, otherwise true.

All of the side-effects that apply to using exec apply to test.