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I work at the unix command line (bash shell) on a Mac 10.6.8. In a text file, I want to replace all multiple newlines, even if the newlines have other whitespace between them, with EEEEE. All single newlines I want to leave alone. Thus the following file, called textfile:
dogs rats

must be transformed into
dogs rats
But as you see from the example below, the following regular expression, issued at the command line, doesn't do it.
Here is the example:
> cat textfile
dogs rats

> perl -p -e 's/\n\s*\n/EEEEE/g' textfile
dogs rats


Is there a simple or elegant solution?

In reply to regular expression: match multiple newlines by wegelin

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