Laravel doesn't recognize RegEx containing special character | or ] [duplicate]

Question

This question already has an answer here:

• Laravel preg_match(): No ending delimiter '/' found 1 answer

I'm trying to check if a sentence contains the special character | or ] using Laravel/Lumen validation in the controller like below:

'to_address' => 'required|max:200|regex:/^[^(|]~`!%^&*=};:?><’)]*$/',

If I user this validation on my controller, I'm getting the following error

{
    "error": "preg_match(): No ending delimiter '/' found"
}

Without | and ] the validation is working correctly.

Answer 1

通常，规则数组可以解决此问题。

'to_address' => ['required', 'max:200', 'regex:/^[^(|]~`!%^&*=};:?><’)]*$/'],

Answer 2

Both | and ] are special characters in regular expressions, so you need to escape them with the \\ character:

'to_address' => 'required|max:200|regex:/^[^(\|\]~`!%^&*=};:?><’)]*$/',

If the pipe is supposed to be an OR , then you will need to use an array, as mentioned in Laravel preg_match(): No ending delimiter '/' found

Further reading:

• Regular Expression Reference: Special and Non-Printable Characters