Regular Expression to match cross platform newline

2019-01-13 12:08发布

问题:

My program can accept data that has newline characters of \n, \r\n or \r (eg Unix, PC or Mac styles)

What is the best way to construct a regular expression that will match whatever the encoding is?

Alternatively, I could use universal_newline support on input, but now I'm interested to see what the regex would be.

回答1:

The regex I use when I want to be precise is "\r\n?|\n".

When I'm not concerned about consistency or empty lines, I use "[\r\n]+", I imagine it makes my programs somewhere in the order of 0.2% faster.



回答2:

The pattern can be simplified to \r?\n for a little performance gain, as you probably don't have to deal with the old Mac style (OS 9 is unsupported since February 2002).