Fix pattern name URL regex to account for Windows paths with backslash. Fix #222

[reedjones]

Description

Fixed url pattern regex to account for windows paths
Fixes # (issue)

#222

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have added an appropriate CHANGELOG entry

[thibaudcolas]

Thank you @reedjones! I don’t have a way to test this on Windows at the moment unfortunately, but your report in #222 and the changes here make sense to me, and seem to work fine on macOS – so let’s proceed with this.