Copying text from PDFs, legacy databases, Microsoft Word documents, and web pages frequently introduces hidden Unicode artifacts, non-breaking spaces, duplicate line breaks, and mismatched quotation marks. Text cleaning and normalization standardizes raw data.
Common Hidden Text Defects
- Zero-Width Characters: Invisible characters (like Zero-Width Space
U+200B) that break search indexing and regex parsers. - Curly Quotes vs Straight Quotes: Smart quotes (
“ ” ‘ ’) break code syntax and JSON parsing, requiring conversion to straight ASCII quotes (" '). - Mismatched Line Endings: Windows (
CRLF / \r\n) vs Unix (LF / \n) line breaks causing formatting bugs in developer pipelines. - Consecutive Blank Lines: Spurious empty lines from PDF copy-pasting that inflate document length.
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