[Solved] How to validate image file extension with regular expression using JavaScript [duplicate]

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Accordingly your issue the regular expression is quite simple. 

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

Do you really sure that nothing else will be used? For example, JPEG format allows both .jpg and .jpeg extensions. That’s why I put e? pattern in the regular expression.

Example of validation could be as follows:

var filename = "/site/images/test.png";
if ( /\.(jpe?g|png|gif|bmp)$/i.test(filename) ) {
. . .

.

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solved How to validate image file extension with regular expression using JavaScript [duplicate]