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### What problem does this PR solve? [#1987](https://github.com/infiniflow/ragflow/issues/1987) When scanning PDF files character by character, the parser excluded spaces if the string did not match regex. Text from [Russian documents](https://github.com/user-attachments/files/16659706/dogovor_oferta.pdf) needs spaces, but it does not match the regex because it uses different alphabet. That's why PDFs were parsed incorrectly and were almost unusable as source. Fixed that by adding Russian alphabet to regex. There might be problems with other languages that use different alphabets. I additionally tested [PDF in Spanish](https://www.scusd.edu/sites/main/files/file-attachments/howtohelpyourchildsucceedinschoolspanish.pdf?1338307816) and old [a-zA-Z...] regex parses it correctly with spaces. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)