Is there a way to know if the file extension is an image?

i got this.

image/png

Already try with

var imageReg = /\.(gif|jpg|jpeg|tiff|png)$/i;
string = "image/png"
imageReg.test(string)

But this return false;

Is there a way to know if the file extension is an image?

i got this.

image/png

Already try with

var imageReg = /\.(gif|jpg|jpeg|tiff|png)$/i;
string = "image/png"
imageReg.test(string)

But this return false;

• javascript
• regex

Share Follow asked Jun 23, 2015 at 4:46 carloss medranoocarloss medranoo 1,48933 gold badges1515 silver badges2121 bronze badges 2

• 2 Well, the path image/png has no extension, it's as simple as that. – Ja͢ck Commented Jun 23, 2015 at 4:57
• as simple as i didnt know and thats why i ask that – carloss medranoo Commented Jun 23, 2015 at 5:03

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1 Answer 1

Sorted by: Reset to default 13

Put dot and / inside a character class so that it would match .png or /png strings.

var imageReg = /[\/.](gif|jpg|jpeg|tiff|png)$/i;

Your regex would return true if there is a dot before png but here there exists a forward slash, so it fails.