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I do not believe there is a 3rd party polyfill for lookbehind as it is quite tricky to implement regular expressions. If you found one, please let me know. Than

• ntoskrnl 4y ago
  There's always this: https://xregexp.com/ https://xregexp.com/ But it's not really a polyfill, just a library.
  • eyelidlessness 4y ago
    On mobile and can’t tell whether xregexp still doesn’t have lookbehind, but in case it doesn’t I found this: https://github.com/beaugunderson/xregexp-lookbehind https://github.com/beaugunderson/xregexp-lookbehind