PHP正则表达式 - 忽略括号并加倍我

Question

I have three separate strings as follows:

California (Socal)
New Jersey
Ohio II

I want to extract the following string from each respectively:

California
New Jersey
Ohio

So basically I want to drop anything that begins with a parenthesis or a double I. Here is what I have tried but I'm not sure how to proceed:

([a-z]+.[a-z]+)

Answer 1

Using preg_replace will be easy for this:

$arr = array(
  "California (Socal)",
  "New Jersey",
  "Ohio II"
);

foreach($arr as $a){
    $a = preg_replace("/(II|\().*/", "", $a);
}

Here its replacing anything after the II or ( with empty.