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Old 11-26-2004, 11:12 AM   #1
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Regular expression question.


I would like to have a *unknown* number of '+' signs with one space.

So "+" should be " "
also "+++" should be " "
and "++++++" should be " ".

I came up with the following:

$ echo "1 + 2 ++ 3 +++++" | sed -e 's/\++/ /g'

But this replaces all double plus signs ("++") with a space.
So "+" is not replaced and "++++" is replaced with to spaces (" ")

I have tried groups and brackets and everything I could come up with.

Has somebody else any idea or solution?


Old 11-26-2004, 11:23 AM   #2
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Your reg is fine, just enable it with the -r switch

$ echo "1 + 2 ++ 3 +++++" | sed -r 's/\++/ /g'
Old 11-29-2004, 10:15 PM   #3
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Yeah, the use of '+' (meaning one or more) in an regex is considered an extended notation. To do the same thing without needing extended notation, try:

echo "1 + 2 +++ 3 ++++++" | sed -e 's/++*/ /g'
This will match a single '+', followed by zero or more additional '+', and replace them with a space.


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