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#1
06-20-2012
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How to specify beginning-of-line/end-of-line characters inside a regex range
How can I specify special meaning characters like ^ or $ inside a regex range. e.g Suppose I want to search for a string that either starts with '|' character or begins with start-of-line character. I tried the following but it does not work: Code:
sed 's/\([|^]\)/<do something here>/g' file1 It is obviously interpreting ^ as the literal caret character. Any way out? |
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#2
06-20-2012
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This works on solaris using ksh93: Code:
$ cat x.dat kldfhvlkjsdhv ;aslkflksdfj sadfkjlskdjf gcw|test123 gcw^test456 ;lksdkhdsf ;lkhaddhb hdashdkj $ sed 's/[|^]test/found_it/' x.dat kldfhvlkjsdhv ;aslkflksdfj sadfkjlskdjf gcwfound_it123 gcwfound_it456 ;lksdkhdsf ;lkhaddhb hdashdkj $ |
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#3
06-20-2012
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I don't think I made myself clear. Let me give an example. Suppose the file I have is: Code:
testABCD jklmn|testDEFGH klmnoptestABCD I want the sed command to replace only the first two instances of the string "test" with "found_it", i.e. the output should contain: Code:
found_itABCD jklmn|found_itDEFGH klmnoptestABCD i.e. the string test should only be replaced with found_it if it occurs after a pipe or at the beginning of the line. I suppose this can be achieved with : Code:
sed -e 's/^test/found_it/g' -e 's/|test/found_it/g' file1 but shouldn't this be achievable using regex patterns too? |
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#4
06-20-2012
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I believe some versions of sed allow a logical or. Mine does not. Try this: Code:
sed 's/^test\||test/found_it/g' filename If portability is a concern, you might want to stick with something like this: Code:
sed 's/|test/FOUND/g;s/^test/FOUND/g' filename |
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