# How to Find or Validate an Email Address

## REGULAR EXPRESSION

    /((?:[\.\-\_\w\d])+\@(?:\w|\d)+(?:\.(?:\w)+)+)/gi

## EXPLANATION

* /((?:[\.\-\_\w\d])+\@(?:\w|\d)+(?:\.(?:\w)+)+)/gi
	* 1st Capturing group ((?:[\.\-\_\w\d])+\@(?:\w|\d)+(?:\.(?:\w)+)+)
		* (?:[\.\-\_\w\d])+ Non-capturing group
			Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]
			* [\.\-\_\w\d] match a single character present in the list below
				\. matches the character . literally
				\- matches the character - literally
				\_ matches the character _ literally
				\w match any word character [a-zA-Z0-9_]
				\d match a digit [0-9]
				\@ matches the character @ literally
		* (?:\w|\d)+ Non-capturing group
			Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]
			* 1st Alternative: \w
				\w match any word character [a-zA-Z0-9_]
			* 2nd Alternative: \d
				\d match a digit [0-9]
		* (?:\.(?:\w)+)+ Non-capturing group
			Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]
				\. matches the character . literally
		* (?:\w)+ Non-capturing group
			Quantifier: + Between one and unlimited times, as many times as possible, giving back as needed [greedy]
			\w match any word character [a-zA-Z0-9_]
* g modifier: global. All matches (don't return on first match)
* i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])

## JAVASCRIPT EXAMPLE
    var re = /((?:[\.\-\_\w\d])+\@(?:\w|\d)+(?:\.(?:\w)+)+)/gi;
    var str = 'correo de facebook agreguenme halcon0324@hotmail.com.mx =)\ningeni-ero.ajrr@hotmail.com\nhola, espero pertenecer a la comunidad. nbreuerp@hotmail.com';
    var m;

    while ((m = re.exec(str)) !== null) {
    if (m.index === re.lastIndex) {
        re.lastIndex++;
    }
	    // View your result using the m-variable.
	    // eg m[0] etc.
    }