Regex that matches anything not ending in .json

For a web app I'm trying to come up with a javascript regex that matches anything not ending in `.json`. Sounds simple but I'm finding it pretty damn hard.

I first wanted to do it like this: `^.*(?!\.json$)`, but that obviously didn't work as it simply matches the entire string. Then I tried `^[^\.]*(?!\.json$)` but that matches `ab` in `abc.json`.

I've come so far as to come up with two regexes that do the job, but I want to have one regex that can do this.


// Match anything that has a dot but does not end in .json
^.*\.(?!json$)
// Match anything that doesn't have a dot
^[^\.]*$


I like

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to test them.

I am using the regexp as part of ExpressJS route definition in ``app.get(REGEXP, routes.index)``.

Try `/^(?!.*\.json$).*$/`

/^(?!.*\.json$).*$/.test("foo.json")
false
/^(?!.*\.json$).*$/.test("foo")
true
/^(?!.*\.json$).*$/.test("foo.html")
true

maybe instead of testing "match (not .json)" you could test "not match (.json)", which is easy ?

I would create a regex to match .json and then when you check for it reverse the logic with a

> match == false

That would be much simpler and it shows what you are trying to do making it a lot more obvious to other programmers.

You can always just get the file extension and then compare it.

Regex to find file extension

`/\.[^.]*$/`

get the file extension with

var extension = /\.[^.]*$/.exec("something.json");

if(extension[0] === ".json"){
//do something
}