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How to validate names with apostrophes in them

Black Sulfur
Black Sulfur asked
Last Modified: 2016-08-28
I am trying to do simple php validation on a name field. But what I have now blocks everything except letters and spaces. What if the person has a ' in their name which isn't uncommon. e.g.: O'Brian

if (!preg_match("/^[a-zA-Z ]*$/",$_POST['name'])) {
  $error .= "Only letters and white space allowed"; 

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