I'm trying to write a simple RegExp that would validate a login name:
function _validateLogin( login ) {
//This should allow for [a-zA-Z0-9_] as well as '.' and '@'
//Spaces are not allowed
var re = /[\w\.@]+/;
return re.test( login );
}
But for some reason it returns true even if I give it 'aa aa'.
What am i doing wrong?
Change your regex to ^[\w.@]+$ to match with entire string. I case aa aa it will return true , since aa will match . So use ^ at beginning for assert position at beginning of a string and $ at end for assert position at end of the string. Also there is no need for escape ., since dot doesn't have any have special meaning inside a character class.
function _validateLogin(login) {
//This should allow for [a-zA-z0-9_] as well as '.' and '@'
//Spaces are not allowed
var re = /^[\w.@]+$/;
return re.test(login);
}
console.log(_validateLogin('aa aa'));
console.log(_validateLogin('aaaa'));You're not anchoring the regex. It will return true for any string that contains a letter, digit, underscore, dot, or at sign anywhere.
Fix: var re = /^[\w.@]+$/;
