Ant regex replace without leaving blank lines -

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I am using that regular expression in which to change rows -foo : 

  ^. * (- foo \ b). * $

After the replacement, there is a bunch of empty blank rows where the lines were originally present. How can I change this to remove the line instead of leaving a blank line?

The context that I am doing is an ant script and if it helps, then the whole line is: 

  & lt; Replaceregexp file = "..." match = "^. * (- foo \ b). * $" Replace = "" byline = "true" /> Disable the line by line processing and replace the regular expression to include line separators, replace

Every event with a new line.

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