URL | Code Cookbook

URL validation

This will match multiple URLs on a line.

[(http(s)?):\/\/(www\.)?a-zA-Z0-9@:%._\+~#=]{2,256}\.[a-z]{2,6}\b([-a-zA-Z0-9@:%_\+.~#?&//=]*)

I made this and tested in VS Code.

https:\/\/[\w./#-]*

It does not match ?= or trailing / or Jekyll {{ URLs.

Add a space or \s or \( at the start to find URL in a certain context.

Insecure URLs excluding localhost. Make secure. Using VS Code find and replace.

Check for a URL in a markdown document - searching for both the alternate text and target.

Generally the pattern is:

[Alt text](target)

Here sare

Internal and external paths. Allows for empty target too - ().
```
  \[.+\]$.*$
```
Internal path.
```
  \[.+\]$(?!http).+$
```
Internal absolute path.
```
  \[.+\]$/.+$
```
External URLs.
```
  \[.+\]$http.+$
```
HTTP URL that is not secure.
```
  \[.+\]$http[^s].+$
```
Internal path which is not a # ID reference or Jekyll link.
```
  \[.+\]$(?!(http|[{#])).+$
```

Note www without a protocol is also external but not considered here as I don’t use that style.

Find an external URL and convert to []() format, remove protocol and www in the label - using regex find and replace in VS Code.

Includes an optional trailing slash (if not matched, this gets left outside the pattern after the () part).

Find:

   (https:\/\/)(www\.)?([\w./-]+[\w-]+)(/?)

Note leading space. This could be remove for lines starting with URL.

Samples:

` https://stackedit.io/ => stackedit.io`
` https://github.com/MichaelCurrin/nested-jekyll-menus => [github.com/MichaelCurrin/nested-jekyll-menu](https://github.com/MichaelCurrin/nested-jekyll-menus`
` https://github.com/MichaelCurrin/nested-jekyll-menus/ => [github.com/MichaelCurrin/nested-jekyll-menu](https://github.com/MichaelCurrin/nested-jekyll-menus/`

This variation handles # ID values.

Find:

  (https:\/\/)(www\.)?([\w./-]+[\w-]+)(#[\w-]*)?(/?)