Safari does not support lookbehind regex

[imanjra]

Found at https://github.com/IBM/graphql-query-generator/blob/master/src/provide-variables.ts#L21

https://caniuse.com/js-regexp-lookbehind

Safari: Version 14.1.1 (16611.2.7.1.4)
OS: 11.4 (20F71)