regular expression breaking script

[matthewamzn]

I've run into a problem with a regular expression (from the regex library). It stops my script from functioning. Is there a character that needs to be escaped for javascript?

$(function(){

$('#submit').click(function(){
var code = $('#youtube_address').val();

if (code.match(/^http://\w{0,3}.?youtube+\.\w{2,3}/watch\?v=[\w-]{11}/) != undefined) {
alert ('This is a valid youtube address.');

} else {
alert ('This is not a valid youtube address.');
}

});
});

[jdMorgan]

Mostly the slashes (which delimit the entire pattern), but also literal periods. This modified pattern might be what you intended:

 if (code.match(/^http:\/\/(\w{0,3}\.)?youtube\.\w{2,3}\/watch\?v=[\w-]{11}/) != undefined) 

Jim

[astupidname]

Also, .match() returns either an array of match/matches or null, so checking for undefined would be incorrect, use !== null instead (and always use the true equality === or true inequality !== when comparing to null)