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need assistance: sed and repeating patterns

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# 1  
Old 02-02-2008
need assistance: sed and repeating patterns
hi,
I need to write a command with sed to find all the lines in a file that contain patterns of three or more characters that repeat once and put them inside perenthezes. I cannot tell sed what pattern to look for. it should find repeated patterns automatically.
example: "firstpatternsecondpattern" would get "first(pattern)second(pattern)" or "1234512345" would get "(12345)(12345)"
# 2  
Old 02-02-2008
nevermind.
I just figured it out.

sed 's/\(.*\{3,\}\)\(.*\)\(\1\)/(\1)\2(\3)/g' file
Last edited by metalwarrior; 02-02-2008 at 05:13 AM..
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