QueryBuilder broken on web - Invalid regular expression: invalid group specifier name

Issue Description

The QueryBuilder is broken in the new 0.2.29 release due to this change: https://github.com/typeorm/typeorm/pull/4760 Regex lookbehinds are not supported in on a lot of web environments, a fallback should be implemented. This affects any driver that uses JavascriptCore (Safari, React Native, …)

Expected Behavior

I’d expect QueryBuilder to work

Actual Behavior

QueryBuilder crashes with Invalid regular expression: invalid group specifier name

Steps to Reproduce

I would add an reproducible example, however, I feel the issue is clear enough without?

My Environment

Dependency	Version
Operating System	React Native, Android
Typescript version	v4.0.5
TypeORM version	v0.2.29

Additional Context

Relevant:

• https://bugs.webkit.org/show_bug.cgi?id=174931
• https://stackoverflow.com/questions/641407/javascript-negative-lookbehind-equivalent

Relevant Database Driver(s)

• aurora-data-api
• aurora-data-api-pg
• better-sqlite3
• cockroachdb
• cordova
• expo
• mongodb
• mysql
• nativescript
• oracle
• postgres
• react-native
• sap
• sqlite
• sqlite-abstract
• sqljs
• sqlserver

Are you willing to resolve this issue by submitting a Pull Request?

• Yes, I have the time, and I know how to start.
• Yes, I have the time, but I don’t know how to start. I would need guidance.
• No, I don’t have the time, although I believe I could do it if I had the time…
• No, I don’t have the time and I wouldn’t even know how to start.

[LuigiMaestrelli]

Any ideas on when this will be released? Every single release from 0.2.25 to 0.2.30 has some kind of bug on react-native…

[timroes]

This issue was released now since a month and effects most Android/iOS and all Safari usages. It feels this should be critical enough to revert the causing PR and release a 0.2.30 timely?