正则表达式的应用 Use #2: Text processing in general a spectrum of uses, from small to big Sma‖!fies: replacing " ugly quotes"with"smart quotes converting files between operating systems · Bigger tasks spell checking formatted documents(HTML): must extract text pretty printing code: find comments, etc; add format directives正则表达式的应用 • Use #2: Text processing in general – a spectrum of uses, from small to big • Small fixes: – replacing "ugly quotes" with “smart quotes” – converting files between operating systems • Bigger tasks – spell checking formatted documents (HTML): must extract text – pretty printing code: find comments, etc; add format directives 3