改进的email检查js脚本

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function isEmail(str)

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{

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// are regular expressions supported?

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var supported
= 0;

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if (window.RegExp) {

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var tempStr
= "a";

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var tempReg
= new RegExp(tempStr);

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if (tempReg.test(tempStr)) supported
= 1;

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}

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if (!supported)

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return (str.indexOf(".")
> 2)
&& (str.indexOf("@")
> 0);

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var r1
= new RegExp("(@.*@)|(\\.\\.)|(@\\.)|(^\\.)");

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var r2
= new RegExp("^.+\\@(\\[?)][a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$");

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return (!r1.test(str)
&& r2.test(str));

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}