How to use lookahead and $ with Regex

Question

I am trying to get the name of the resource, I will share with you the regexr url

My actual regular expression: ([^/]+)(?=\..*)

My example: https://res-3.cloudinary.com/ngxcoder/image/upload/f_auto,q_auto/v1/blog-images/5oonz9.jpg

I'm trying to get just 5oonz9

I tried to include $, but I don't know why it doesn't work

Answer 1

You can use:

^.+\/(.+)\..+$

• ^.+ - From the start, match as many characters as possible
• \/ - Match a literal /.
• (.+) - Match one or more characters and capture them in a group
• \. - Match a literal .
• .+$ - Match one or more characters at the end of the string (the extension)

Live demo here.