How to match patterns in with regular expressions

i开发者_如何学C want to to validate a string if contains only a-z, 0-9, and the symbols . - _ @ and ; i have this code:

var regex = new RegExp('[a-z0-9@.;_-]{8,}');

and is not far from what i am looking for but it return true also for:

'123@123.com °%'

I'm working with jquery to load the string by a div, i put a some code more:

    var mailinglist= $('#mailinglist').val();
    var regex = new RegExp('\^[0-9a-z.-_;@]{8,}$\','i');

    if (mailinglist.match(regex)){}
    else{}

i need the match to return false if is present a blank space or any other char not defined in the pattern.

thanks :-)

Add the start- and end-of-string anchors.

var regex = /^[a-z0-9@.;_-]{8,}$/
//           ↑                 ↑

Also, unless you have some dynamic pattern, prefer the regex literal /.../ over constructing a RegExp object from string new RegExp('...').

ok found here on stackoverflow, i had to search better

How to validate input using javascript