slevithan/regex

Is there a way to check if this package is supported?

spaceemotion opened this issue · 2 comments

spaceemotion commented

I stumbled over this package as I was trying to improve the performance of our RegExes and noticed the disclaimer about the v flag that's required. I know that not every customer has a "modern" machine, so is there a way to check if this package is supported at all?

Something like isSupported to check if I can even use this setup would be nice, so that I can implement a fall back for older browsers/systems.

I guess one way of doing it is to check via a try-catch, but I am not sure if I am missing anything else:

function isSupported() {
  try {
    new RegExp('', 'v');
    return true;
  } catch (e) {
    return false;
  }
}
slevithan commented

Your isSupported function should work great. Probably better is directly running regex``; behind your try catch, rather than new RegExp('', 'v');. You could also check for the existence of RegExp.prototype.unicodeSets so you don't need try/catch.

  • 👍1
slevithan commented

As of v2.1.0, regex no longer relies on native support for flag v and works in much older browsers (see details in the readme under "Compatibility"). Testing for support should no longer be needed.

  • 👍1