Regular expression that identifies any string that does not conclude with .json

Question

Regular expression that identifies any string that does not conclude with .json

Currently, I am grappling with creating a JavaScript regex for a web application that identifies anything not ending in .json. It seems like a straightforward task, but it is proving to be quite challenging.

Initially, my approach was using this regex pattern: ^.*(?!\.json$), however, it only matched the entire string. Next, I attempted ^[^\.]*(?!\.json$) which ended up matching ab in abc.json.

I have managed to come up with two separate regex patterns that accomplish the task individually, but I am determined to consolidate them into a single regex.

// Identifies anything with a dot except for those ending in .json
^.*\.(?!json$)
// Identifies anything without a dot
^[^\.]*$

To test these regex patterns, I utilize http://regex101.com/#javascript.

In my ExpressJS route definition, I implement the regexp within app.get(REGEXP, routes.index).

javascript regex express

Answer 1

Answer №1

Attempt using this regular expression: /^(?!.*\.json$).*$/

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

Answer 2

Attempt using this regular expression: /^(?!.*\.json$).*$/

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

Answer 3

Answer №2

If you want to check the file extension, one way is to extract it using regular expressions.

Here's a regex pattern to find the file extension:

/\.[^.]*$/

You can then extract the file extension like this:

var ext = /\.[^.]*$/.exec("example.txt");

if(ext[0] === ".txt"){
    // Do something
}

Answer 4

If you want to check the file extension, one way is to extract it using regular expressions.

Here's a regex pattern to find the file extension:

/\.[^.]*$/

You can then extract the file extension like this:

var ext = /\.[^.]*$/.exec("example.txt");

if(ext[0] === ".txt"){
    // Do something
}

Answer 5

Answer №3

Have you considered trying to test for "not match (.json)" instead of testing for "match (not .json)?" It might be simpler.

Answer 6

Have you considered trying to test for "not match (.json)" instead of testing for "match (not .json)?" It might be simpler.

Answer 7

Answer №4

To efficiently target .json files, I suggest developing a regex expression for them. When validating the presence of .json files, consider flipping the logic with a

validation == false

This approach would streamline the process and clarify your intentions, enhancing readability for fellow developers.

Answer 8

To efficiently target .json files, I suggest developing a regex expression for them. When validating the presence of .json files, consider flipping the logic with a

validation == false

This approach would streamline the process and clarify your intentions, enhancing readability for fellow developers.

Regular expression that identifies any string that does not conclude with .json

Answer №1

Answer №2

Answer №3

Answer №4

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