To match an optional character or sequence, use the question mark quantifier (?).

 


package{
  import flash.display.Sprite;
  
  public class Main extends Sprite{
    public function Main(){
        var betterPhoneNumber:RegExp = /\(?\d{3}\)?-?\d{3}-?\d{4}/;
        trace(betterPhoneNumber.test("(703)222-1234")); //true
        trace(betterPhoneNumber.test("310-222-1515")); //true
        trace(betterPhoneNumber.test("7242229090")); //true
    }
  }
}

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3.	To flag it to match globally and multiline, the following will work:
4.	Regular expression /\w/ is created in ActionScript
5.	Matching Using a Regular Expression Object
6.	To know whether at least one match exists.
7.	Use the exec() method.
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9.	String Methods and Regular Expressions
10.	To escape a character, simply preface it with a backslash (\). This goes for the backslash character as well.
11.	Use ranges with the dash character (-), and you can have multiple ranges in one character class, as well as combine ranges with single characters
12.	invert a character class by using a caret (^) immediately after the open bracket ([).
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14.	(*) quantifier matches zero or more times:

To match an optional character or sequence, use the question mark quantifier (?). : RegExp « Regular Expressions « Flash / Flex / ActionScript

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