I came across this piece of code that I'm testing to determine if a file added to a canvas is an image. I'm curious about the functionality behind it. Just to clarify, "file" refers to a FileList obtained from an input element.
if (/^image\/\w+/.test(file.type))
/^image\/\w+/ is a regular expression that can identify strings like "image/png" and "image/jpeg", along with any other strings starting with "image/".
/^image\/\w+/.test(s) checks to see if the string variable s adheres to the regex pattern.
if (/^image\/\w+/.test(file.type))In simple terms, this code snippet represents a regular expression used to validate the file type based on a specific pattern.
The pattern being checked for is as follows:
- It must begin with 'image' - After 'image', there should be a forward slash '/' - Following the forward slash, there should be one or more alphanumeric characters or underscore '\w+'
For example, if the input is 'image/abc', it will match the pattern. However, if the input is only 'image/', it will not match the pattern.
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