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Perl
Perl Misc
I think an assertion might do this?
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[QUOTE="Jim Gibson, post: 4874658"] Yes, tr can be used as n:1 or 1:0 mappings, not just 1:1. If you want to redo a regular expression from the beginning of the string and keep repeating it until it fails to match, put it in a while loop: while( s/(\n)\n/$1/g ) { ; } However, you have already been given the simplest solution using regexes: s/\n{2,}/\n/g; which fixes your string in one pass, as do all the look-around variations. [/QUOTE]
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I think an assertion might do this?
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