如何使用正则表达式获取字符串的一部分

Question

I have this situation where I can have strings like this:

"Project\\V1\\Rest\\Car\\Controller"
"Project\\V1\\Rest\\Boat\\Controller"
"Project\\Action\\Truck"
"Project\\V1\\Rest\\Helicopter\\Controller"
"Parental\\Boat\\Action"

Just in case the string follow the pattern:

"Project\\V1\\Rest\\THE_DESIRED_WORD\\Controller"

I want to get THE_DESIRED_WORD.

That's why I'm thinking in a regular expression.

Answer 1

to use a regular expression, you need to escape the slash twice : once for the PHP string and once for the regex

try this :

$tab = array(
    "Project\\V1\\Rest\\Car\\Controller",
    "Project\\V1\\Rest\\Boat\\Controller",
    "Project\\V1\\Rest\\Helicopter\\Controller",
    "Project\\V1\\Rest\\Water\\Controller",
);

foreach ($tab as $s) {
    preg_match("!\\\\([^\\\\]*)\\\\Controller!U", $s, $result);
    var_dump($result);
}