Find if value is contained in comma separated values in JS

This would work:

if( first.match(new RegExp("(?:^|,)"+second+"(?:,|$)"))) {
    // it's there
}

First, split your String to an array:

var second = 'cat';
var first = 'dog,cat,lion';
var aFirst = first.split(',');

Then cycle through your new array

for (var i = 0; i < aFirst.length; i++) {
    if (aFirst[i] == second) {
        alert('jay!');
    }
}

You can use Array.indexOf:

if( first.split(',').indexOf(second) > -1 ) {
   // found
}

Need IE8- support? Use a shim: https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/indexOf

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