Matching the string "/$" in a RegExp constructor

Question

I'm trying to match the phrase "/$" using the RegExp constructor, but no amount of escaping seems to help. Am is missing something?

RegExp("\/\$").test("/$")
// false
RegExp("/$").test("/$")
// false
RegExp("\/$").test("/$")
// false
RegExp("/\$").test("/$")
// false

`RegExp("\\/\\$").test("/$")` – Pranav C Balan Jul 19 '16 at 05:31 — Pranav C Balan, Jul 19 '16 at 05:31

score 2 · Accepted Answer · edited May 23 '17 at 11:59

You need to use \\ instead of \ and there is no need to escape / or use regex /\/\$/ directly. Check RegExp documentation for more info.

When using the constructor function, the normal string escape rules (preceding special characters with \ when included in a string) are necessary.

For example, /\w+/ is equivalent to new RegExp('\\w+')

console.log(
  RegExp("/\\$").test("/$")
)

//or

console.log(
  /\/\$/.test("/$")
)

1 Answers1