How to write a regex pattern which accepts space in between words?

I am very new to the regex patterns. I am developing one api which accepts the user value(status), based on the status it will perform the filtering operation upto this it’s working fine.

Now what my requirement is I want to accept the value based on:

1. if the string contains multiple words it should be separated by space only not other symbols(/_) .

   MEDevel.com: Open-source for Healthcare and Education

   Collecting and validating open-source software for healthcare, education, enterprise, development, medical imaging, medical records, and digital pathology.

   Visit Medevel

2. Both caps and small letters are allowed .

Valid scenarios:

1. Ready to dispatch
2. ReaDy To Dispatch
3. cancelled
4. CanceLled

Invalid scenarios:

1. Ready_to_dispatch

2. Ready-to-Dispatch

   $pattern=[a-zA-Z];
   $validation=preg_match($pattern,$request->status);
   if($validation){
     //My logic executes if it matches the pattern
   }
   

>Solution :

For the pattern you could repeat the character class one or more times, and as only a space is allowed between the words, optionally repeat the same character class preceded by a space.

^[A-Za-z]+(?: [A-Za-z]+)*$

You could update the code to placing the pattern between quotes and add delimiters / around the pattern.

$pattern="/^[A-Za-z]+(?: [A-Za-z]+)*$/";
$validation = preg_match($pattern,$request->status);

if($validation){
    //My logic executes if it matches the pattern
}