[SOLVED] how to exclude everything except a pattern with sed
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The response to my comment about SED vs AWK is of course correct---my comparison was "apples and oranges". And AWK is definitely the right answer in many situations.
The hard thing is to always state precisely the criteria to be used when constructing code to match patterns. It sometimes takes a bit of thought to be sure you know what is to be matched and what is NOT to be matched.
Looking at the data sample in the original post, there is no obvious reason to be concerned about the column position---only the detection of the specific patterns "07" and "08". It's up to the owner of the file to be sure that an **adequate** regex is being used.
Looking at the data sample in the original post, there is no obvious reason to be concerned about the column position---only the detection of the specific patterns "07" and "08".
but then again, if you look at the sample data, a "name" and "date" column might have "08" or "07". eg a user can have account name user08, or john07 or the date column may have things like 2010/07/23. Of course, this is based on "educated" guess, since OP doesn't provide actual data format. its advisable to look at specific column and not the whole line.
correct---the safest thing is to make the code as restrictive as possible. My main point is that the user has to make the judgement as to how hard they need to work to get the results they want----you can often do very simple things IF you know what's in the file.