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I'm trying to split a filename consisting of arbitrary number of space-separated words into two separate strings by searching for the first occurrence of a symbol '-', and then switch the order of those strings. For e.g if the filename is originally

word1 word 2 ... word9 - wordA wordB ... wordZ

then the desired output is

wordA wordB ... wordZ - word1 word2 ... word9

Note that there can be more than 1 word on both sides of the '-'. My sed code is

sed -r 's/([a-zA-Z0-9]+) \- ([a-zA-Z0-9])*/\2 \- \1/'

My question is how to specify arbitrary number of words before and after the '-' in sed. I am aware that sed only supports up to 9 patterns.

I've read a past question but the question is about switching a known fixed number of words.

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1 Answer 1

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Try this:

echo 'word1 word 2 ... word9 - wordA wordB ... wordZ' | sed 's/\(.*\) - \(.*\)/\2 - \1/'

Output:

wordA wordB ... wordZ - word1 word 2 ... word9
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    It worked. Thank you so much. Now I need to learn what /(.*) means from sed documentation. Commented Jan 30, 2016 at 11:26

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