How to replace URL resource path with regex?

Question

I am trying to write a regular expression that will match a link-attribute in .png files.

Example: I have a lot of .png like this

https://jnTb6EZom8c/s144/800px-s%25252Ct%252529%2520%25282%2529.png
https://jnTb6EZom8c/s1300/800px-s%25252Ct%252529%2520%25282%2529.png
https://jnTb6EZom8c/s50/800px-s%25252Ct%252529%2520%25282%2529.png

I want to search for /s144 /s1300 /s50 and so on and replace it with /s400+c. My Regex /\/s\B\d{2,4}/ works fine in Regex-Tester.

Now I want to do the job with vim, but I always get 'pattern not found'. What is wrong with my regular-expression?

Answer 1

There's a few problems with your version. / needs to be backslash escaped in the Vim find command line*, and {2,4} type repeats also need a preceding backslash. The \B zero-width non-word boundary atom does not exist in Vim-flavour regular expressions, but I don't think it's actually required for your purpose, anyway.

Try /\/s\d\{2,4}/

See :help pattern-overview for details of Vim's regular expressions.

_{* Note that in other contexts, such as in an :s command, you can use almost any non-alphanumeric character as a regular expression delimiter. If you want to include / characters in your expression, just use a different character for your delimiter.}