[removed] negative lookbehind equivalent?

Question

Is there a way to achieve the equivalent of a negative lookbehind in javascript regular expressions? I need to match a string that does not start with a specific set of cha

Answer 1

Lookbehind Assertions got accepted into the ECMAScript specification in 2018.

Positive lookbehind usage:

console.log(
  "$9.99  €8.47".match(/(?<=\$)\d+(\.\d*)?/) // Matches "9.99"
);

Negative lookbehind usage:

console.log(
  "$9.99  €8.47".match(/(?

Platform support:

• ✔️ V8
  • ✔️ Google Chrome 62.0
  • ✔️ Microsoft Edge 79.0
  • ✔️ Node.js 6.0 behind a flag and 9.0 without a flag
  • ✔️ Deno (all versions)
• ✔️ SpiderMonkey
  • ✔️ Mozilla Firefox 78.0