What is a cross platform regex for removal of line breaks?

Question

I am sure this has been asked before, but I cannot find it.

Basically, assuming you are parsing a text file of unknown origin and want to replace line breaks with so

Answer 1

The regex to find any Unicode line terminator should be (?>\x0D\x0A?|[\x0A-\x0C\x85\x{2028}\x{2029}]) rather than as drewk wrote it, at least in Perl. Taken directly from the perl 5.10.0 documentation (it was removed in later versions). Note the braces after \x: U+2029 is \x{2029} but \x2029 is an ASCII whitespace (U+0020) + a digit 2 + a digit 9. \n outside a character class ,is also not guaranteed to match \x{0a}.