You could use Javascript's substring method. For example:
var list = ["bird1", "bird2", "pig1"]
for (var i = 0; i < list.length; i++) {
if (list[i].substring(0,4) == "bird") {
console.log(list[i]);
}
}
Which outputs:
bird1
bird2
Basically, you're checking each item in the array to see if the first four letters are 'bird'. This does assume that 'bird' will always be at the front of the string.
So let's say your getting a pathname from a URL :
Let's say your at bird1?=letsfly - you could use this code to check the URL:
var listOfUrls = [
"bird1?=letsfly",
"bird",
"pigs?=dontfly",
]
for (var i = 0; i < list.length; i++) {
if (listOfUrls[i].substring(0,4) === 'bird') {
// do something
}
}
The above would match the first to URL's, but not the third (not the pig). You could easily swap out url.substring(0,4) with a regex, or even another javascript method like .contains()
Using the .contains() method might be a little more secure. You won't need to know which part of the URL 'bird' is at. For instance:
var url = 'www.example.com/bird?=fly'
if (url.contains('bird')) {
// this is true
// do something
}