Get extension from filename javascript regex. doc, . The following regex var patt1=/[0-9a-z]+$/i; extracts the file extension of strings such as filename-jpg filename#gif filename. Dec 3, 2025 · Whether you’re building a file uploader, a document manager, or a media gallery, knowing how to extract file extensions reliably in JavaScript is essential. docx, . hello Yes . png How to modify this regular expression to only return an extens Jan 25, 2012 · I think this is a better approach as matches only valid directory, file names and extension. Let us look at few ways to extract the extension part from a file name using inbuilt javascript methods. Feb 16, 2023 · In the removeExtension () function, we have created the regular expression as explained above and stored it in the regex variable. hello No hello. We’ll start with the basics of filenames and regex, explore common and advanced patterns, and provide practical examples for tools like the command line, Python, and JavaScript. iojjuo tpoc rrfzmbc inhpdvf hjob sczs lgs jakt kfraxlq mbmrgf