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### What problem does this PR solve?
```
f"{re.escape(entity_index_delimiter)}(\d+){re.escape(entity_index_delimiter)}"
->
fr"{re.escape(entity_index_delimiter)}(\d+){re.escape(entity_index_delimiter)}"
```
### Type of change
- [x] Bug Fix (non-breaking change which fixes an issue)
Signed-off-by: Jin Hai <haijin.chn@gmail.com>