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I need a regular expression to validate image file extensions in javascript. Do you have one ?

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Could you explain the purpose?

Anyway here's one assuming you support few image types.

(/\.(gif|jpe?g|tiff?|png|webp|bmp)$/i).test(filename)

I have put the whole regular expression within parentheses () so as to disambiguate between the slash (/) operator and RegExp object. See JSLint for more details.

Here's the raw regex as well.

/\.(gif|jpe?g|tiff?|png|webp|bmp)$/i

This Regex also assumes that you're including the dot before the extension. Remove the \. if you're not.

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5 Comments

Instead of jpg|jpeg you can do: jpe?g
How about adding webp to this list?
Could we consider .ico as na image ?
How would this look like when you also want to include capitalised extensions? And thank you for your answer
@Woww the /i part makes it case insensitive, i.e. include capitalised

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