Quick question about regex_match

When using regex_match, how would I be able to use the - character? An example of the code is posted below. What would be the correct format? Thanks! 
 

Code:

$rules = [
    'date' => 'required|min_length[2]|max_length[50]|regex_match[/^+[a-zA-Z0-9.- ]+$/]',
];

Escape the - character with a backslash:
 

PHP Code:

$rules = [
    'date' => 'required|min_length[2]|max_length[50]|regex_match[/^+[a-zA-Z0-9.\- ]+$/]',
]; 


Thank you @includebeer it's working now.

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