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Prototype Methods

RegExp.prototype.exec()

Executes a search for a match in its string parameter. It is the reverse of String.prototype.match().

RegExp.prototype.test()

Tests for a match in its string parameter.

RegExp.prototype.toString()

Returns a string representing the specified object. Overrides the Object.prototype.toString() method.


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<!DOCTYPE html><html><body><script>


   var r = /a/gi;
   console.log(r.exec("123abcABC"));                               // ["a", index: 3, input: "123abcABC"]
   console.log(r.test("123abcABC")); // true
   console.log(r.toString()); // /a/gi

</script></body><html>

This standard function allows you to retrieve the query strings in a URL.


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<!DOCTYPE html><html><body><script>

function getParameterByName(name, url) {
    if (!url) url = window.location.href;
    name = name.replace(/[\[\]]/g, "\\$&");
    var regex=new RegExp(
                               "[?&]"+name+"(=([^&#]*)|&|#|$)"),
          results = regex.exec(url);
    if (!results) return null;
    if (!results[2]) return '';
    return decodeURIComponent(results[2].replace(/\+/g, " "));}var foo = getParameterByName('foo');

</script></body><html>

The following standard function validates an email address.


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<!DOCTYPE html><html><body><script>

function validateEmail(email) {
    var re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email);}

</script></body><html>