JQuery Validation Email Regex not working -

i trying build validation system in jquery without using plugins

my jquery code such, have validation function each input, e.g.:

function isemail(email) {   var regex = /^([a-za-z0-9_\.\-\+])+\@(([a-za-z0-9\-])+\.)+([a-za-z0-9]{2,4})+$/;   alert("email "+regex.test(email));   return regex.test(email); } 

you notice have alert in one, because email not validating despite regex being borrowed highly-reputed answer -> email validation using jquery

i tested several valid emails no avail. valid emails taken here -> http://en.wikipedia.org/wiki/email_address#valid_email_addresses. changed regex /\s+/ , else worked know problem lies within regex.

anyways, why regex not evaluate true? understanding is:

/^([a-za-z0-9_\.\-\+])+ 

begins character a-z, a-z, 0-9, ., -, or +. 1 or more times

\@ 

followed "@" symbol

(([a-za-z0-9\-])+\.)+ 

followed 1 or more of 1 or more characters a-z,a-z,0-9, or -, period "."

([a-za-z0-9]{2,4})+$ 

ending 1 or more of two, three, or 4 characters a-z,a-z,0-9

edit

i have news, there strange behaviour going on here. @ jsfiddle copied , pasted code -> http://jsfiddle.net/hxcd3/. email evaluates true. if visit website working on -> danmacmill.host22.com, , type same thing contact email input, displays false.

you notice logged email variable passed jquery in console can see exact string. why not validating question. reference, here validation checker code:

function check(isvalid, name, message) {     if (! isvalid(name) ) {         if (! $('#div-'+name).hasclass("warned") ) {             $('#div-'+name).prepend('<div class="bubble-wrapper"><div class="bubble"><p>'+message+'</p></div></div>');             var div = $('#div-'+name).position();             $('#info p:first-child').text("top: "+div.top);             $('#info p:nth-child(2)').text("left: "+div.left);             $('#div-'+name+' .bubble-wrapper').css({                 top: div.top - 35 + "px"             });             $('#div-'+name).addclass("warned");         }         return false;     }     else         return true; } 

the regex mentioned --which well known way, match 99% of emails.

the reason why believe it's not working you feeding function emails surrounding space or spacing, must trim emails before testing them.

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-- edit --

your script (myscript.js:170) has error:

    if (! check(isemail, "email", "invalid email.") ) { 

remove quotes around email variable

    if (! check(isemail, email, "invalid email.") ) { 

same thing lines: 159 , 171