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Multiple long field separators

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# 1  
Old 01-05-2013
Multiple long field separators
How do I use multiple field separators in awk?

I know that if I use
Code:
awk -F"[ab]"

, both a and b will be field separators. But what if I need two field separators that both are longer than one letter?

If I want the field separators to be "ab" and "cd", I will not be able to use
Code:
awk -F"[abcd]"

. The latter would make both a, b, c and d into field separators.
# 2  
Old 01-06-2013
Suppose you want 'foo' and 'ooo' as words to be record separators:

Code:
awk -F'(foo)|(ooo)'  '{print $2}' somefile

the regex is (for modern awk, nawk on solaris only) :
Code:
-F '(word1)|(word2)|(wordn)'

Each word in parenthesis, separated by a pipe.
# 3  
Old 01-06-2013
Quote:
Originally Posted by jim mcnamara
Suppose you want 'foo' and 'ooo' as words to be record separators:

Code:
awk -F'(foo)|(ooo)'  '{print $2}' somefile

the regex is (for modern awk, nawk on solaris only) :
Code:
-F '(word1)|(word2)|(wordn)'

Each word in parenthesis, separated by a pipe.
Although what you suggested will work just fine, it is even simpler than that. Either of the following will also set foo and ooo as FIELD (not RECORD) separators:
Code:
awk -F 'foo|ooo' ...
awk -F '(f|o)oo' ...

and for the original request:
Code:
awk -F 'ab|cd' ...

is all that is needed.
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