regex - Replace all instances of a character within context

Question

The below is an example of a very large text file that I have:

@Don't replace this line: <http://nomatch.com#>
/or this line!/

<http://example.com#Example/Replace/With/Underscores> and <http://example.com#Example/Replace/With/Underscores2> 

</Nothing to replace on this line either./>

I would like to replace all instances of / (forward slash) on each line after <http://example.com#Example/ and before >. Therefore, the resulting file should look like:

@Don't replace this line: <http://nomatch.com#>
/or this line!/

<http://example.com#Example_Replace_With_Underscores> and <http://example.com#Example_Replace_With_Underscores>

</Nothing to replace on this line either./>

So far I have come up with the regex: (?=.*?>)/, but this is grabbing every / on a line with a > (link to example). At the moment I'm using VSCode to perform the find and replace.

question from:https://stackoverflow.com/questions/65948959/replace-all-instances-of-a-character-within-context

Answer 1

You can use

(?<=<http://example.com#Example/[^>]*)/(?=[^>]*>)

See the regex demo. Details:

• (?<=<http://example.com#Example/[^>]*) - a positive lookbehind that makes there is a <http://example.com#Example/ string followed with any zero or more chars other than > as many as possible immediately to the left of the current location
• / - a / char
• (?=[^>]*>) - a positive lookahead (if you need to make sure there is a closing >) that makes there there are zero or more chars other than > and then a > char immediately to the right of the current location.

See Visual Studio Code demo and settings: