>Sent: Tuesday, 4 October 2011 05:07
>To: vim_use@googlegroups.com
>Subject: How to match lines containing patternA but not containing patternB?
>
>Facing with a data file which contains more than 7 million lines, I need to delete all >lines containing <patternA> but not containing <patternB>.
>So far the only way I can think of is kind messy, something like this:
>
>:g/<patternB>/s/<patternA>/<patternC>/
>:g/<patternA>/d
>:%s/<patternC>/<patternA>/
>
>But I really like to know how this can be done in a better way, like a single global >replacement command or something.
That seems to cover it, but you can sometimes use a screwdriver instead of pliers: faster, too. If you have Linux or Cygwin GNU tools, you can emulate what you did above, and perhaps put them into a bash script for later use. The bash command using grep & sed is, all on one line:
sed -e /patternB/s/patternA/patternC/ <input.txt | grep -v patternA | sed -e s/patternC/patternA/ >output.txt
Think green - keep it on the screen.
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