need assistance: sed and repeating patterns

metalwarrior · #1 (**permalink**) 02-02-2008

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)"

metalwarrior · #2 (**permalink**) 02-02-2008

I just figured it out.

sed 's/\(.*\{3,\}\)\(.*\)\(\1\)/(\1)\2(\3)/g' file

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