Regular Expression to match cross platform newline characters

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Question :

Regular Expression to match cross platform newline characters

My program can accept data that has newline characters of n, rn 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.

Asked By: Alan

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Answer #1:

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

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

Answered By: too much php

Answer #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).

Answered By: Diego V

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