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Could someone explain the following code in English please:<br />
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$validFormat = ereg(&quot;^(3[0-9]{4}|2131|180<wbr />0)[0-9]{11<wbr />}$&quot;, $this-&gt;__ccNum);<br />
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The code is validating a JCB type credit card number. I've read an explanation for the function ereg at <a href="http://www.phpbuilder.com/manual2/manual/fi/function.ereg.php" rel="ugc">http://www.phpbuilder.com/manual2/manual/fi/function.ereg.php</a>&nbsp;, but I'm looking for a bit more help.<br />
<br />
eg how does this work: &quot;^(3[0-9]{4}|2131|1800)[0-<wbr />9]{11}$&quot;<br />
what does ^ mean?<br />
I think | = or<br />
<br />
The valid format for JCB is:<br />
1. prefix = 3 and lenght = 16 or<br />
2. prefix = 2131 or 1800 and length = 15<br />

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Could someone explain the following code in English please:

$validFormat = ereg("^(3[0-9]{4}|2131|1800)[0-9]{11}$", $this->__ccNum);

The code is validating a JCB type credit card number. I've read an explanation for the function ereg at http://www.phpbuilder.com/manual2/manual/fi/function.ereg.php , but I'm looking for a bit more help.

eg how does this work: "^(3[0-9]{4}|2131|1800)[0-9]{11}$"
what does ^ mean?
I think | = or

The valid format for JCB is:
1. prefix = 3 and lenght = 16 or
2. prefix = 2131 or 1800 and length = 15


Syntax used with ereg

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