For example, assuming that
x = filename.jpg, I want to get
filename could be any file name (Let’s assume the file name only contains [a-zA-Z0-9-_] to simplify.).
x.substring(0, x.indexOf('.jpg')) on DZone Snippets, but wouldn’t
x.substring(0, x.length-4) perform better? Because,
length is a property and doesn’t do character checking whereas
indexOf() is a function and does character checking.
If you know the length of the extension, you can use
x.slice(0, -4) (where 4 is the three characters of the extension and the dot).
If you don’t know the length @John Hartsock regex would be the right approach.
If you’d rather not use regular expressions, you can try this (less performant):
Note that it will fail on files without extension.