API EditBox GetNumber

This function reads text entered into the editBox, tries to convert it into a number, and returns corresponding numerical value, or 0 if text didn't look like a number.
 num = editBox:GetNumber()
=== Arguments ===
:none
=== Returns ===
:;num: number entered in the EditBox
=== Details ===
This function proves to be very useful when reading in numbers. While GetText() will return a string, which you can't perform any arithmetic operations or comparison with, this function converts the TextString to a number. This will even work for all strings that are considered as well formed numerical constants in lua (so it will work for '314.16e-2' too).
Function will scan editbox text and return once it finds text which cannot be interpreted as part of a number. It will return number recognized so far, or 0 if there were no valid digits recognized. The function will never return nil. For example (User input => Function returns):
* ":)" => 0
* "123punks! 42" => 123
* "-2.78" => -2.7799999713898
* "+3.15" => 0
* "222e-03" => 0.22200000286102
* "0.31415926536e+1" => 3.1415927410126
* "14e6" => 14000000
* "21,000" => 21
== Note ==
To verify that a 0 returned is indeed the numerical value in the editbox field, convert the results of GetNumber() to a string using tostring(), and compare to the results of GetText().