Regex: add exception (exact match) to existing regex-CodePudding

I have this regex: (. ?)(?:index\.html?|\.html?)(.*)?$

This is used (case-insensitive) to trigger redirects for all URLs which contain "index.html" or ".html". This part is removed by triggering a redirect with the two matching groups and leaving out the middle part (which is either "index.html" or ".html").

Example input URL: https://www.example.com/somePath/subPath/index.Html?someQueryString

This will be redirected to: https://www.example.com/somePath/subPath/?someQueryString

This is all working as expected, but now I want to add an exception to this regex. The exception is that this redirect should not be triggered if a certain word exists in the first group.

Let's say this word is "safePath". The following URL should not trigger a redirect, because it contains the word "safePath" in the first group: https://www.example.com/safePath/subPath/index.Html?someQueryString

How can I change my regex expression to honor this exception?

CodePudding user response：

This seems to work, though it returns three capturing groups instead of two (it splits the first part of the link into two groups):

(https://www.example.com/)(?!safePath/)(. ?)(?:index\.html?|\.html?)(.*)?$

(Note: This only matches if safePath is the first group in the link as specified in the question. So a link like https://www.example.com/somePath/safePath/index.html?someQueryString will still match because safePath is in the second group.)

Test code in Python

EDIT: I think this should detect whether safePath is anywhere in the URL:

^(?!.*/safePath/)(. ?)(?:index\.html?l\.html?)(.*)?$

CodePudding user response：

The following URL should not trigger a redirect, because it contains the word "safePath" in the first group: https://www.example.com/safePath/subPath/index.Html?someQueryString

On way you can probably do this with a negative lookahead in the regex:

(?!.*safepath)(. ?)(?:index\.html?|\.html?)(.*)?$
   ^^^^^^

...Or, potentially, you could make this a separate conditional - i.e. something like:

if(url.contains?('safepath')) {
  return false;
}

(This is only intended as pseudo-code, since you didn't specify a language/tools being used.)