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1033a3ae26
- Add whitespace validation to the PDF English text checking regex
- Reduce false negatives in English PDF content recognition
### What problem does this PR solve?
The core idea is to **expand the regex content used for English text
detection** so it can accommodate more valid characters commonly found
in English PDFs. The modifications include:
- Adding support for **space** in the regex.
- Ensuring the update does not reduce existing detection accuracy.
### Type of change
- [✅] Bug Fix (non-breaking change which fixes an issue)