带有preg_match（）的PHP正则表达式

I want to check if a variable contains only alphabetical characters and apostrophes (') and dashes (-) and white space ( ) characters. How can do I this with preg_match() in PHP?

I have /[^a-zA-Z'-\s]/i and it solved without apostroph.

preg_match('/^[\s\pL'-]+$/',$string)

This is the way I'd do it

//EDIT

Maybe if you have a minimum count of letters, use this:

preg_match("/^[\s\pL'-]{5,}$/",$string) //{x,} ---> x is your min number

Try /^[a-zA-Z'\-\s]*$/ as your regex string. Note that this regex will also match blank strings.