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Example of using Regular Expressions for syntax checking in JavaScript

JavaScript Interview Questions and Answers

(Continued from previous question...)

15. Example of using Regular Expressions for syntax checking in JavaScript


...
var re = new RegExp("^(&[A-Za-z_0-9]{1,}=[A-Za-z_0-9]{1,})*$");
var text = myWidget.value;
var OK = re.test(text);
if( ! OK ) {
alert("The extra parameters need some work.\r\n Should be something like: \"&a=1&c=4\"");
}

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