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sed & ex examples showcasing use cases of regex syntax for group capturing & backreferencing
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| # Lowercase all html tags | |
| $ ex - '+%s,<\(.*\)>,<\L\1>,' -cwq index.html |
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| # Uncomment lines respecting indentation | |
| $ sed -e 's,^\([[:space:]]*\)#\([^!].*\),\1\2,' test.sh |
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