Php pcre正则表达式 - 用反斜杠分割文本

Question

I need this string: "test1 test2-test3\test4" to be split into 4 strings:

Array
(
    [0] => test1
    [1] => test2
    [2] => test3
    [3] => test4
)

What am I doing wrong?

I've tried this:

<?php

    $aa = 'test1 test2-test3\test4';
    $arr = preg_split('#[\s|\|-]+#u', $aa);
    print_r($arr);

?>
Array
(
    [0] => test1
    [1] => test2
    [2] => test3\test4
)

And this:

<?php

    $aa = 'test1 test2-test3\test4';
    $arr = preg_split('#[\s|\\|-]+#u', $aa);
    print_r($arr);

?>
Array
(
    [0] => test1
    [1] => test2
    [2] => test3\test4
)

To no avail. For some reason it doesn't split by backslash- why?

Answer 1

Try three slashes \:

    $arr = preg_split('#[\s|\\\|-]+#u', $aa);

And you don't need the alternation in the character class:

    $arr = preg_split('#[\s\\\-]+#u', $aa);