PHP Regex: How to match \r and \n without using [\r\n]?

Question

I have tested \\v (vertical white space) for matching \\r\\n and their combinations, but I found out that \\v does not match \\r

Answer 1

If there is some strange requirement that prevents you from using a literal [\r\n] in your pattern, you can always use hexadecimal escape sequences instead:

preg_match('#[\xD\xA]+#', $string)

This is pattern is equivalent to [\r\n]+.